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## A company is setting its direct materials and direct labor standards for its leading product. Direct material costs from the supplier areâ€‹ \$7 per squareâ€‹ foot, net of purchase discount.â€‹ Freight-in amounts toâ€‹ \$0.10 per square foot. Basic wages of the assembly line personnel areâ€‹ \$19 per hour. Payroll taxes are approximatelyâ€‹ 25% of wages. How much is the direct labor cost standard perâ€‹ hour

The formula for calculating the direct labor standard is:

Direct labor standard = Basic wages + Payroll tax

or

Direct labor standard = Basic wages + 25% of Basic wages

Substituting the given values into the equation:

Direct labor standard = \$19 + 0.25 * \$19

Direct labor standard = \$23.75

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## Marie Tyndall is a student in the Jackson Heights Community College Medical Assisting Program. She and two other classmates have been assigned the project of creating a plan for cleaning up spills that might occur in the classroom laboratory and ensuring that all students using the laboratory have been trained in the proper procedure. Questions: 1.What materials would her group need? Describes these materials and how they would be used. 2. How would her group go about learning the proper steps in the clean-up process? 3. How would her group ensure that all other students in the laboratory also have the proper training?

1. The group of students will need a computer and printer, and the most necessary part is to follow the rules of the OSHA regulations for cleaning up spills. At first they should design the procedure and its structure. Then they have to create a checklist of students that must receive the training. The students can elaborate their work by creating a PowerPoint presentation as it is very convenient for a group working. The students can divide into groups  to divide their responsibilities and each group would need a prepackaged spill clean-up kit or supplies to create their own kit, a three-ring binder, a few tabs for the binder and access to the OSHA  regulations on the computers.
2. The way how the group can go about learning the proper steps in the clean-up process is to study the needed information in the textbook. They also can make a small research using the Internet but the most important step is to interview medical personnel in a local medical laboratory in order to make sure that the information that was taken from web is actually useful.
3. The way how the group can ensure that all other students in the laboratory also have the proper training is to create a check-off document which will make sure that all the steps are followed properly. At the end of the procedure, the leader of the group must ask the students to show how they  clean up a spill to check whether all the students understood the information.

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## Which statement BEST summarizes the paragraph about Frank Lloyd Wright? A. After attending college, Frank Lloyd Wright successfully launched his architectural career. B. Frank Lloyd Wright knew that using more affordable building materials would secure his fame in architecture. C. Frank Lloyd Wright studied engineering, worked as a draftsman, and eventually worked with famous architects. D. By diverging from traditional architectural design, Frank Lloyd Wright was able to develop more practical and affordable housing.

Which statement BEST summarizes the paragraph about Frank Lloyd Wright? A. After attending college, Frank Lloyd Wright successfully launched his architectural career. B. Frank Lloyd Wright knew that using more affordable building materials would secure his fame in architecture. C. Frank Lloyd Wright studied engineering, worked as a draftsman, and eventually worked with famous architects. D. By diverging from traditional architectural design, Frank Lloyd Wright was able to develop more practical and affordable housing.

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## ?_____ are used to assemble machinery, weld joints, and a variety of other tasks by manipulating materials and tools.

The answer here is ROBOT. Robots are re-programmable, multi -functional machines that are capable of performing different types of tasks that require repeated manipulation of tools and materials. There are different types of industrial robot and programming languages.

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## A company is setting its direct materials and direct labor standards for its leading product. basic wages of the assembly line personnel are \$19 per hour. payroll taxes are approximately 23% of wages. how much is the direct labor cost standard per hour? (round your answer to the nearest cent.)

A company is setting its direct materials and direct labor standards for its leading product. basic wages of the assembly line personnel are \$19 per hour. payroll taxes are approximately 23% of wages. how much is the direct labor cost standard per hour? (round your answer to the nearest cent.)

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## Colleen plans to start a small business by making and selling skirts. A sewing machine costs \$250, and she estimates that she will spend \$15 on materials for each skirt. Which expression represents Colleen’s total costs, in dollars, for making x skirts?

Colleen plans to start a small business by making and selling skirts. A sewing machine costs \$250, and she estimates that she will spend \$15 on materials for each skirt. Which expression represents Colleen’s total costs, in dollars, for making x skirts?

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## _ is the process in planetary formation when heavy materials sink towards the plants center lighter material accumulate near its surface

The correct answer is – 4) Rainfall.

The rainfall is crucial and the most important factor that contributes to the formation of the soil. The rainfall has such big influence because of few things:

– weathering

The water from the rainfall contributes to the weathering of the rocks, thus making them in little sandy pieces.

– plant life

The plant life needs water to exist, and the rainfall provides that. Further, the plants that die are the biggest factor that helps into the soil formation and fertilization.

– animal life

Once there’s rainfall and plants, the animals can exist too, and the animals are very import in both the fertilization of the soil, and fertilization of the plants that also fertilize the soil.

– decomposition

The dead plants and animals decompose much quicker and much more efficiently when there’s bigger humidity and water, so the rainfall is essential in this process.

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## Department w had 2,400 units, one-third completed at the beginning of the period; 16,000 units were transferred to department x from department w during the period; and 1,800 units were one-half completed at the end of the period. assume the completion ratios apply to direct materials and conversion costs. what is the equivalent units of production used to compute unit conversion cost on the cost of production report for department w? assume the company uses fifo.

The basis to respond this question are:

1) Perpedicular lines form a 90° angle between them.

2) The product of the slopes of two any perpendicular lines is – 1.

So, from that basic knowledge you can analyze each option:

a.Lines s and t have slopes that are opposite reciprocals.

TRUE. Tha comes the number 2 basic condition for the perpendicular lines.

slope_1 * slope_2 = – 1 => slope_1 = – 1 / slope_2, which is what opposite reciprocals means.

b.Lines s and t have the same slope.

FALSE. We have already stated the the slopes are opposite reciprocals.

c.The product of the slopes of s and t is equal to -1

TRUE: that is one of the basic statements that you need to know and handle.

d.The lines have the same steepness.

FALSE: the slope is a measure of steepness, so they have different steepness.

e.The lines have different y intercepts.

FALSE: the y intercepts may be equal or different. For example y = x + 2 and y = -x + 2 are perpendicular and both have the same y intercept, 2.

f.The lines never intersect.

FALSE: perpendicular lines always intersept (in a 90° angle).

g.The intersection of s and t forms right angle.

TRUE: right angle = 90°.

h.If the slope of s is 6, the slope of t is -6

FALSE. – 6 is not the opposite reciprocal of 6. The opposite reciprocal of 6 is – 1/6.

So, the right choices are a, c and g.

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## Study the map in Image A. What does it show about the spread of printed materials across Europe? Which areas of Europe produced the most printed books? Why do you think these areas produced the most books?

The correct answer is C) Native Americans fought as enemies against the United States in the Battle of the Thames but as allies in the Battle of New Orleans.

The statement that best shows the difference between the Battle of the Thames and the Battle of New Orleans is “Native Americans fought as enemies against the United States in the Battle of the Thames but as allies in the Battle of New Orleans.”

We are talking about battles occurred during the War of 1812 between the United States and Great Britain in the American territory. The war ended in 1815.

On October 5, 1813, the Battle of Thames was fought. The US army got an important victory over the British troops, securing its Northwest frontier. The Battle of New Orleans was fought on January 8, 1815. The British troops were trying to capture it and control the territory, but they couldn’t. General Andrew Jackson resisted and ed the American troops to an important victory.

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## Elecrical wiring is commonly composed of metal covered in plastic ir rubber coating which of these materials is an insulator and which is a conductor

The equation for how temperature changes the resistance R is:

R=R₀(1+α(T-T₀)), where R₀ is the resistance at T₀=20°C, T is the temperature for which we want to calculate the resistance and α is the temperature coefficient for resistance.

The resistance of the copper wire increases by 18% or by 0.18, so the new value for the resistance is R=1.18*R₀.

T₀=20°C
=0.0068
R=1.18*R₀

Now we need to input that into the equation for resistance change and solve for temperature T.

1.18R₀=R₀(1+α(T-20)), R₀ cancels out,

1.18=1+α(T-20),

1.18-1=α(T-20), we divide by α,

0.18/α=T-20, we put 20 on the left side,

26.47+20=T

T=46.47°C

So the temperature on which the resistance of copper wire will increase by 18% is T=46.47°C.

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## Artists who model forms using soft, pliable materials, such as clay or wax, sometimes employ this kind of support when creating their work.

This sounds like an essay question, i’ll give you some possible points and quotations, maybe some ideas on context, but it’s up to you to develop your own thesis and opinion on this.

f. scot fitzgerald critiques the idea of the american dream (like many other classic authors) through the situations of the characters.

jay gatsby is able to aquire an enormous amount of wealth throughout his life, but he is unable to penetrate the upper class. he ends up being killed after tangling in that crowd for too long

possibly mention the context of the 20s. a tumultuous time following WW1, increase in immigration as well as womens rights and the massive economic boom. (with the crash looming in 1929) there was a belief that anyone could ‘strike it rich’ like gatsby did.

george and myrtle wilson were middle class people looking to improve their life, and achieve the american dream

daisy is the ultimate, perfect example of the american dream.

the darkest secret at the end, gatsby’s wealth didn’t come from work, it came from a life of crime. fitzgerald is basically saying american dream is actually a lost promise.

also underlying greed strewn throughout the novel, and affairs which tear couples apart.

quote:
‘But I didn’t call to him for he gave a sudden intimation that he was content to be alone–he stretched out his arms toward the dark water in a curious way, and far as I was from him I could have sworn he was trembling. Involuntarily I glanced seaward–and distinguished nothing except a single green light, minute and far away, that might have been the end of a dock.’

very key symbol of the green light, and gatsby reaching out to something (the american dream) that he cannot aquire.

hope that helps 🙂 feel free to disagree and develop your own opinions on this subject.

if you want more info, there are plenty of articles full of quotes, examples and ideas on the internet. reading critical perspectives of the great gatsby are also good if you’re willing to look 😀

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## Squire corporation charged job 110 withâ \$13,400 of direct materials andâ \$11,900 of direct labor. allocation for manufacturing overhead isâ 75% of direct labor costs. what is the total cost of jobâ 110? a. â\$8,925 b. â\$41,167 c. â\$34,225 d. â\$25,300

The Contribution Margin per unit (CM) can be calculated
from the difference of Selling Price per unit (SP) and Total Expenses per unit
(TE).

First, let’s calculate the value of SP:

SP = Sales / Units sold

SP = \$1,043,400 / 22,200 units sold

SP = \$47

Second, calculate all expenses:

Direct materials per unit = \$234,948 / 27,970 units
manufactured = \$8.4

Direct labor per unit = \$131,459 / 27,970 units
manufactured = \$4.7

Variable manufacturing overhead per unit = \$240,542 / 27,970
units manufactured = \$8.6

Variable selling expenses per unit = \$113,220 / 22,200
units sold = \$5.1

TE = \$26.8

Therefore the CM is:

CM = SP – TE

CM = \$47 – \$26.8

CM = \$20.2 per unit

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## In a multi-paragraph essay, explain how the activity of individual neurons enables you to perform a simple action like answering your phone. Be sure to describe the main parts of a neuron, explain the unique function of each part, and describe how neurons use electrochemical signals for neurotransmission. Include details from class materials, readings, and research on the nervous system to support your discussion.

There are two systems in the human body that are responsible for the coordination between the functions of different systems to achieve the unity of the living organism’s body. These two systems are the nervous system and the endocrine system. The action of the nervous system is fast and takes a short time, while the action of the endocrine system is slow and takes a long time.

The functional unit of the nervous system is the nerve cell or the neuron. The neuron consists of a cell body and the axon. The cell body starts with the dendrites that receive the messages or the impulses from other neurons or from different sense organs or receptors. These impulses are then transmitted through the cell body. The cell body contains a nucleus and different organelles which help the nerve cell to perform its functions. The nerve impulse is then transmitted to the axon.

The axon is an extension from the cell body. There are some cells called Schwan cells that secrete a myelin sheath to insulate the axon from the surrounding medium. The insulated axons have more ability to conduct the impulses than non-insulated axons. The axon ends with the terminal arborizations. The terminal arborizations of a nerve cell connect to the dendrites of the next cell or to the afferent organ. The gaps between the dendrites and the terminal arborizations are called the synapses.

The nerve impulse is an electrochemical phenomenon i.e. an electrical phenomenon with a chemical nature. The membrane of the axon acts as a barrier between an outside positively charged medium and an inside negatively charged medium. This makes a potential difference of  -70mV. This state is called the resting potential. When the membrane is subjected to a stimulus, the positive charges enter to inside and the negative charges exit to the outside. The potential difference now becomes +40mV. This state is called the depolarization state. The point of stimulation acts as a new stimulus for the next point and so on. The membrane sooner gains its permeability again and the positive charges return to the outside and the negative charges to inside. This state is called repolarization.

The nerve impulse reaches the synapse. There are some neurotransmitters that are excited by the nerve impulse coming and carry the message across the membrane. Some receptors receive theses neurotransmitters on the dendrites of the next neuron. These receptors act as a stimulus for the new cell.

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## After the Civil War, the south a. replaced small farms with large plantations b. farmed in many different ways c. became industrialized d. shipped its raw materials to the North for processing

Industrialization led to rising imperialism because
1) show of power: As one makes new technology, they would either want to test it out or show the other nations that what they produce is ground-breaking and the best. Usually if it is military technology, you would want to test it out, and with the use of “show of force”, can have people groups submit to your country.
2) Better technology: As technology advances, it usually makes something easier. In the case of imperialism, better military advances meant that they could (once again) have other people submit to you
3) Better transportation: This meant that you could take multiple countries at once, and can prove that you’re country is great by having supplies shipped over long distances to keep your troops up. If in need of more troops, you could send more.

hope this helps

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## What is paragraph F mainly about? a. different materials b. clearing an area c. laying the fire d. fire safety

It is very important to train your dog. It keeps your dog’s mind active, and it help to build an understanding between you and your dog. Often, owners will shout at their dogs or even punish them when what is needed is training.

The error in grammar: it help

Correct verb form: it helps

Explanation:

In the simple present tense, third-person singular pronouns, like she, he and it, use conjugated verbs formed by the base form of a verb and the affix -s, -es, or -ies. For example: helps, thinks, cries, watches. In the excerpt provided, the error is in the verb help because it is not correctly conjugated for the pronoun it: it is missing an s at the end.

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## Harris corporation produces a single product. last year, harris manufactured 27,970 units and sold 22,200 units. production costs for the year were as follows: fixed manufacturing overhead \$335,640 variable manufacturing overhead \$240,542 direct labor \$131,459 direct materials \$234,948 sales were \$1,043,400, for the year, variable selling and administrative expenses were \$113,220, and fixed selling and administrative expenses were \$198,587. there was no beginning inventory. assume that direct labor is a variable cost. the contribution margin per unit would be: (do not round intermediate calculations.) \$21.30 per unit \$20.20 per unit \$25.30 per unit \$15.70 per unit

The Contribution Margin per unit (CM) can be calculated
from the difference of Selling Price per unit (SP) and Total Expenses per unit
(TE).

First, let’s calculate the value of SP:

SP = Sales / Units sold

SP = \$1,043,400 / 22,200 units sold

SP = \$47

Second, calculate all expenses:

Direct materials per unit = \$234,948 / 27,970 units
manufactured = \$8.4

Direct labor per unit = \$131,459 / 27,970 units
manufactured = \$4.7

Variable manufacturing overhead per unit = \$240,542 / 27,970
units manufactured = \$8.6

Variable selling expenses per unit = \$113,220 / 22,200
units sold = \$5.1

TE = \$26.8

Therefore the CM is:

CM = SP – TE

CM = \$47 – \$26.8

CM = \$20.2 per unit

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## According to your reading materials, which of the following would not be deleted or replaced when editing your essay for more concise writing?

Here are a few pointers; hope this is useful)

Ovation-by definition- is show of appreciation from an audience, for a person’s accomplishments or flaw.

“Everyone deserves a standing ovation because we all overcometh the world.”

A person’s accomplishment could be how they made a positive change in this world, strong leadership- that makes them a effective leader or simply helping others. A person’s flaw- mistakes in life, sin or even guilt should also be considered an appreciation- an ovation for representing mankind’s flaw and that humanity makes mistakes, fulfilling at least one deadly sin such as greed, lust, selfishness etc.

Thus, regardless of a person’s achievement or flaw- a person deserves an applause for, not the least, living in this society and this world that we are all living together and dying together.

That was just the introduction.. the best part is yet to come.. now it’s your turn!!

Shakespeare’s famous line “All the World’s a stage. That agrees with your line: “Everybody deserves a standing ovation…”

Shakespeare explains that men and women are like players: they live, and die, some being celebrated and some forever living in solitude till their death. Shakespeare states the world is a “stage” which symbolizes that mankind is in its peak. The world is changing everyday: little by little and humanity is falling behind.
Due to our world turning into machinery: factories, an automotive future: where humans only job to live (entrance) and to die (exit) the famous humans remembered and the flawed not recalled.

This is according to Shakespeare’s imagery.

I don’t know what grade your in, but I think simplifying Shakespeare’s word of mouth in your essay would be handy and useful as it has strong references of your quote, and agrees strongly in your essay.

Hope this helps 🙂

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## All of the following are examples of materials except _____. pigments canvas stone brushes

Read this analysis of the Odyssey, Book XIII in order to better understand how to solve this problem.

Once Ulysses is done telling the Phaeacian court about what happened at sea, King Alcinous orders some of his men with the hero to ensure Ulysses’s safe return to Ithaca. While on the ship ride, Ulysses falls asleep. Once the boat reaches Ithaca, the men of King Alcinous do not wake him. Instead, they let him stay asleep, but they move his body from the boat onto shore and they return to their own journey. Minerva, a goddess, then places a ‘grey mist’ over Ulysses to protect him while he’s asleep. When Ulysses does finally wake up, he has some trouble remembering his land. Somehow, Ulysses deep sleep erased his memory of home. Basically this deep sleep allowed Ulysses to the last of his twenty years.

The fact that the Phaeacians followed Joves instructions and brought Ulysses back home anger Neptune. When the Phaeacians discover the fury of Neptune, they then try to satisfy him by making a sacrifice. Although the sacrifices they end up making don’t please Neptune. Neptune ends up sinking the Phaeacians ship by turning it into stone. Even though Jove sees an opportunity to stop Neptune, he does not. His simply also Neptune to destroy their ship.

Minerva ends up disguising herself as a shepherd when she talks to Ulysses. She does so to protect her identity and to test Ulysses. Ulysses passed Minerva’s test by not telling disguised Minerva who he really is. Pleased with this, Minerva then reveals her true identity to him. After that Minerva tells Ulysses about the suitors that are at his palace that are trying to marry his wife and take over Ithaca. Once she has went over the plan, they then plot revenge against them. Once there plan is ready Minerva disguises Ulysses as a beggar to go undercover and see which men are truly loyal.

There is a bit more, but I’ll end it there since that’s about how much information we’ll need.

Now, put the tiles in order according to the analysis.

• Ulysses finishes recounting his adventures of his journey home to the Phaeacians.

• King Alcinous makes arrangements for Ulysses’s safe journey home to Ithaca.

• Ulysses falls asleep after boarding the Phaeacian ship.

• Neptune turns the Phaeacians’ ship into stone.

• Minerva meets Ulysses in the guise of a young shepherd.

• Minerva and Ulysses plot revenge against Penelope’s suitors.

• Minerva disguises Ulysses as an old beggar.

– Marlon Nunez

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## NEED HELP ASAP The Tools Plus Company is planning to produce drills. The company has rented space for its manufacturing operation at \$5,000 per month. each drill requires \$49 worth of materials and \$36 worth of labor. Find the total cost if Tools Plus Company makes 370 drills.

NEED HELP ASAP The Tools Plus Company is planning to produce drills. The company has rented space for its manufacturing operation at \$5,000 per month. each drill requires \$49 worth of materials and \$36 worth of labor. Find the total cost if Tools Plus Company makes 370 drills.

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## Which of the following was a major reason why an agricultural or industrial revolution never developed in Africa? A. Africa lacked the necessary raw materials. B. The gold and ivory trade in Africa was too profitable. C. Africa’s workforce was depleted by the slave trade. D. The majority of land in Africa was infertile.

Answer: The Code of Hammurabi focuses on punishment for crimes, while Magna Carta does not.

Explanation:

The Code of Hammurabi is a well­preserved Babylonian law code of ancient Mesopotamia, dating back to about 1754 BC (Middle Chronology). The code consists of 282 laws, with scaled punishments, as graded depending on social status, of slave versus free man. While the Magna Carta is a medieval document that represents the foundation of civil liberties around the globe. As we can see, the difference remains at the punishment side, included only at the Code of Hammurabi

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## Crude oil is derived from which of the following materials? Marine Organisms Plants Rocks Salts

Answer : The correct option is, salt and water

Explanation :

• Heterogeneous mixtures : It is a type of mixture in which the appearance of the solution throughout is non-uniformly and the particle size or shapes are also different.
• Homogeneous mixtures : It is a type of mixture in which the appearance of the solution throughout uniformly and the particle size or shapes are not different.

Sand and water : It is a heterogeneous mixture in which the particle size of the sand and water are different. The mixture of sand and water can be separated by the physical method like filtration.

Salt and water : It is a homogeneous mixture in which the salt is completely dissolves in the water. The mixture of salt and water can not be separated by the physical method.

Salad dressing  : It is a heterogeneous mixture in which the particle size of the salad are different. The Salad dressing can be separated by the physical method.

Soil : It is a heterogeneous mixture in which the particle size of the solit are different. The soil can be separated by the physical method.

Hence, the salt and water solution is a homogeneous mixture.

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## Which best explains why fungi are often called natural recyclers? They provide a continuous food resource for many other organisms. They break down rotting materials and return nutrients to the soil. They take in large amounts of carbon dioxide, helping to clean the air. They are found in nature and have many different practical uses.

The human activities that lead to soil erosion are deforestation and agriculture.

Explanation:

Soil erosion (the wearing away and displacement of the topsoil) may be caused by natural factors such as strong winds, water, ice and animals, or by human activities that make the soil weak.

Deforestation is the logging or burning of trees for the purpose of construction or the usage of wood for several activities (heating or paper-making). When they remove the vegetation, they leave the upper layer of soil (topsoil) unprotected against winds and water.

Agriculture is the activity of growing crops for the production of food. When farmers plant their vegetation, they remove the topsoil and this is mostly carried away by winds into water streams (they become sediments).

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## A Rock’s Tale Imagine that you are a rock (igneous, metamorphic, or sedimentary). Describe how the materials that make you up moved through the rock cycle to form you. Be sure to include at least one point in time where you were an igneous rock, one point when you were a sedimentary rock, and one point when you were a metamorphic rock, and describe the processes that caused you to change form. PLEASE WRITE ONE TO TWO PARAGRAPHS WITH DETAIL.

Explanation: Isotopes are the elements which have same atomic number but different mass number.

Atomic number is the number of electrons or number of protons in a neutral atom.Mass number is the sum of number of protons and the number of neutrons.

Thus changing the number of electrons would lead to formation of ions of the same element, change in protons would change the atomic number.

The mass number is changed by adding or removing neutrons.

For example, and   are isotopes of carbon element, containing 6 electrons and 6 protons each. The number of neutrons are 6 and 7 respectively.

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## BRANLIEST GETS 55 POINTS!!! HELP ASAP!!! Question: What can you learn about kinetic energy? For example, what other types of forces affect kinetic energy? Use research materials to answer you question. Your experiment must be written so that another group can complete the experiment by following your instructions. My question is: _________________________________ _________________________________ How can I test it: _________________________________ _________________________________ My conclusions are: _________________________________ _________________________________

Latitudes, cloud cover, seasons and water vapor

Explanation:

The factors that affect the amount of incoming solar energy reaching on the surface of the earth are as follows-

1) Latitude- The latitude plays an important role in controlling the incoming solar radiation. The places at the equatorial regions experience more heat energy as the sunlight is directly incident on this region. The polar regions receive lesser solar energy because it becomes difficult for the light to reach that region.

2) Clouds- Clouds acts as albedo as it has the property to reflect solar light back into the atmosphere, thereby keeping the surface comparatively cooler.

3) Season- Season occurs due to the tiltation of the earth. season changes when the earth changes its position relative to the sun. In the summer and spring, the tilt of the earth is towards the northern hemisphere and sunlight is maximum in this region. So it receives more amount of solar energy. Whereas autumn and winter remains comparatively cooler.

4) Water vapor- The presence of water vapor in the atmosphere leads to an increase in the absorption of solar energy. When water vapor is less, it receives less solar energy.

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## On the diagram above, trace the path of a light ray through these materials

1. C
An atom is made up of three particles, which are electron, proton and neutron.
The proton and the neutron are located in the central part of the atom, which is called the nucleus while the electrons orbit around the nucleus. The electron is negatively charged, the proton is positively charged and the neutron does not have any charge.

2. C.
To calculate the average atomic mass of the element, divide the percentage abundance by 100 and then multiply the mass and the abundance value together for each element. After this add all the values obtained together.
a. Mass * abundance = 23.9850 * 0.7899 = 18.9457515
b. Mass * abundance = 24.9858 * 0.1 = 2.49858
c. Mass * abundance = 25.9826 * 0.1101 = 2.86068426
Relative atomic mass = 18.9457515 + 2.49858 + 2.86068426 = 24.30.

3. A particle that orbit the nucleus is called AN ELECTRON.
An electron is the negatively charged component of the atom, which orbit round the nucleus of an atom. The number of electrons that are orbiting round the nucleus of a particular atom depends on the atomic number of that atom.
4. C.
If an element has a charge of -1, that means that the element has gained one electron in the course of chemical bonding and has become an anion. Normally, for a neutral element, the number of proton, neutron and electron ought to be the same. But in the situation where an element has gained one electron, the number of electron will increase by 1 while the number of proton and neutron remain the same. That is why 9, 9, 10 written at option C is correct.

5. D.
An isotope is defined as an element, which has two or more forms which differ in the number of neutrons in their nucleus. An isotope is an element which exist in several forms. The major difference between isotopes is the number of neutrons in their nucleus and this neutron number eventually determine their relative atomic mass. Thus two isotopes will have different neutron number and different mass number.

6. B.
In the diagram given, there are five neutrons, four proton and two electrons. The atomic particles that can be used here to determine the correct element are neutrons and protons, this is because they do not participate in chemical bonding therefore there number is always constant. The proton number of four indicates that the element we are searching for is beryllium, because beryllium has four protons and five neutrons in its nucleus.

7. B.
The atomic number of iron is 26 but its mass number is 56. Since its atoms are composed of three different particles, the particles number are as follows: electron = 26, proton = 26 and neutron = 30.
Neutron number = mass number – proton number = 56 – 26 = 30.
In the question we are given, the iron element has undergone a bonding process and it has given away two electrons, to become a cation, that is why it is written as Fe2+. Thus, its electron number will become: 26 – 2 = 24. But this process does not affect the neutron number.

8. D.
Quarks refer to subatomic particles which possess fractional electric charges. They are usually find in the proton and the neutron which are located inside the nucleus of an atom. Quark is not found in electrons.

9. D.
The atomic number of sulfur is 16, that means that, it has 16 electrons, 16 protons and 16 neutrons in its atom at the neutral state. Sulfur has many isotopes, the number of neutrons in the isotopes varies greatly. Note that, the proton number of an atom determines its atomic number.

10. B.
Quarks are sub-atomic particles which are usually find inside the proton an the neutron which are located in the nucleus of an atom. High energy electrons and accelerators are usually used to study this sub particles. The electrons which orbit round the nucleus do not have quarks in their interiors.