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Li designed a survey to determine how comfortable students at her middle school are with fractions. There are 600 students in her middle school. The students are equally distributed among grade levels. She selected a sample of 28 students in her first-period class. Which best explains Li’s sample?

The correct answer to this is:

Nonrandom and biased

The method of Li’s sampling has a
tendency that some elements or portion in the population has no chance of
selection. Further, it was not stated which portion of the population she
obtained the sample thus we cannot accurately determine the probability of
selection. This kind of sampling results in a bias. A biased sampling is a type
of nonrandom sampling.

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A teacher can grade 25 papers in 4 hours. How many papers can he grade in 6 hours?

A teacher can grade 25 papers in 4 hours. How many papers can he grade in 6 hours?

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Which option best states the purpose of an outline? An outline helps you find grammatical errors in your writing. An outline provides the guidelines you need for working in writing groups. An outline provides a way for you to grade your own work. An outline helps you organize information before writing a paper.

Which option best states the purpose of an outline? An outline helps you find grammatical errors in your writing. An outline provides the guidelines you need for working in writing groups. An outline provides a way for you to grade your own work. An outline helps you organize information before writing a paper.

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Collins Middle School has 252 sixth grade students. If the sixth grade is 35% of the total school, how many students are in the middle school?

Collins Middle School has 252 sixth grade students. If the sixth grade is 35% of the total school, how many students are in the middle school?

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There are 42 boys and girls participating in an essay-writing competition. Of the competitors, 21 are in seventh grade, 14 are in eighth grade, and 7 are in ninth grade. What is the probability of an eighth grader winning the competition? Which simulation(s) can be used to represent this situation?

You need to determine the number of ways in which 30 competitors from 50 can qualify. First, you have to realize that the order is irrelevant, that is: it is the same competitor_1, competitor _2, competitor _3 than competitor_3, competitor_2, competitor_1, or any combination of those three competitors.

So, the number of ways is which 30 competitors from 50 can qualify is given by the formula of combinations, which is:

C (m,n) = m! / (n! * (m -n)! )

=> C (50,30) = 50! / (30! (50 – 30)! ) = (50!) / [30! (50 – 30)!] = 50! / [30! 20!] =

= 47,129,212,243,960 different ways the qualifiying round of 30 competitors can be selected from the 50 competitors.

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Read the scenario. Imagine you are at a gas station to put some gas in a car, and you see the following directions. Turn off car engine. Gas is extremely flammable. Do not use cell phones, other electronic devices, or anything that could cause sparks or a flame. Pay with credit card at pump or pre-pay inside store. After making payment, remove nozzle and select the grade of gasoline desired. Remain at your vehicle as you pump gas. When finished, return nozzle to pump. Collect change and receipts inside store. According to these directions, which of the following is true? 1. If you do not have a credit card, you can pre-pay for the gas inside the store. 2. MP3 players should not be used as you pump gas, but it is okay to use a cell phone. 3. If you want to purchase a bottle of water while pumping gas, you should enter the store while the nozzle is in your car to save time. 4.If you want a receipt, push “yes” at the pump and one will be printed.

Hey there!

Correct answer is D. Comma or Period Inside Rule

A. Question mark or exclamation point inside: those are not really necessary.

B. Colon or semicolon: not, a semicolon would divide the whole sentence and it would be shorten; a colon would work but after requested, when there is already a comma.

C. Question mark or Exclamation Point Outside Rule: would not work, becase it is an very polite and affirmative sentence.

D: A comma or period inside rule: actually, just a comma would work. Please, Cooper’s dad requested, go… Cooper’s dad requested must be in between commas as it is a vocative.

Hope this helps

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System of Equations 8th grade 30 points Bhavik bought 3 liters of milk and 5 loaves of bread for a total of \$11. A month later, he bought 4 liters of milk and 4 loaves of bread at the same prices, for a total of \$10. How much does a liter of milk cost, and how much does a loaf of bread cost?

You need to determine the number of ways in which 30 competitors from 50 can qualify. First, you have to realize that the order is irrelevant, that is: it is the same competitor_1, competitor _2, competitor _3 than competitor_3, competitor_2, competitor_1, or any combination of those three competitors.

So, the number of ways is which 30 competitors from 50 can qualify is given by the formula of combinations, which is:

C (m,n) = m! / (n! * (m -n)! )

=> C (50,30) = 50! / (30! (50 – 30)! ) = (50!) / [30! (50 – 30)!] = 50! / [30! 20!] =

= 47,129,212,243,960 different ways the qualifiying round of 30 competitors can be selected from the 50 competitors.

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Which correlation should be used to measure the relationship between gender and grade point average for a group of college students?? a. ?point-biserial correlation b. ?pearson correlation c. ?phi-coefficient d. ?spearman correlation?

The point that lie on the line is:

B.  (1,1)

Step-by-step explanation:

We are given that a line passes through the point (0,-1) and has a slope of 2.

We know that the equation of a line passing through (a,b) and having slope m is given by:

Here we have:  (a,b)=(0,-1) and m=2

This means that the equation of line is:

Now we will check which option is true.

A)

(2,1)

when x=2

we have:

Hence, option: A is incorrect.

B)

(1,1)

when x=1

we have:

Hence, option: B is correct.

C)

(0,1)

when x=0

we have:

Hence, option: C is incorrect.

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During a grade school field trip, ryan and his friends were running down a hill when he stepped on a snake. he was unharmed but shaken by the experience. when one of his friends mentioned the incident months later, ryan could not remember running down the hill that day. freud would say that this is an example of

The answer is C. In order to carefully control conditions and confirm or disconfirm a hypothesis about the causes of behavior, one must perform an experiment.

Explanation:

Experimental research allows the researcher to control all the variables in order to create the conditions that can confirm or disconfirm a hypothesis. This method aimes to establish a relation of causality between two variables, which means that one variable is generated and determined by the other; this is posible because all of the other variables that can influence it have been controlled.

When a researcher conducts a survey or engages in naturalistic observation, he can’t control the variables, therefore, he can only establish a correlation between two variables, but not of causality.

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A group of eight grade 11 and five grade 12 students wish to be on the senior prom committee. The committee will consist of three students. What is the probability that only grade 12 students will be elected, assuming that all students have an equal chance of being elected?

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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Peter decides to mix grades of gasoline in his truck. He puts in 11 gallons of regular and 7 gallons of premium for a total cost of \$76.99. If premium gasoline costs \$0.25 more per gallon than regular, what was the price of each grade of gasoline?

Peter decides to mix grades of gasoline in his truck. He puts in 11 gallons of regular and 7 gallons of premium for a total cost of \$76.99. If premium gasoline costs \$0.25 more per gallon than regular, what was the price of each grade of gasoline?

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Roger spent 45 minutes studying for the test. Assuming the trend that exists in the data set below applies to Roger as well, approximately which grade should Roger expect to receive on the test? Time Spent Studying (minutes) Grade on Test (%) 0 28 0 54 30 45 30 39 30 63 60 53 60 75 90 85 90 78 120 92 120 100 120 98 120 89 180 99 180 95

Stock A:

Zachary bought 40 shares of stock A at \$80 a share. So he paid 40*80 = 3200 dollars for the shares of stock A.

He then sells stock A at \$83 a share, so 83*40 = 3320 is the amount he gets back. The net result is 3320-3200 = 120. Divide this over the initial cost to get 120/3200 = 0.0375

So the rate of return (ROR) for stock A is 3.75%

—————————————

Stock B:

total cost = (number of shares of stock B)*(cost per share of stock B)
total cost = 80*160
total cost = 12800

Then he sells stock B at \$166 a share

80*166 = 13280

He nets 13280 – 12800 = 480 dollars from stock B

The ROR for stock B is 480/12800 = 0.0375 = 3.75%

So far, we see that the ROR for both stocks (A and B) are the same at 3.75%

—————————————

Bond:

par value = \$1000
coupon = (0.0525)*(1000) = \$52.50

ROR = (coupon)/(price) = 52.50/775 = 0.0677 = 6.77%

—————————————

In summary, we have

ROR for stock A = 3.75%
ROR for stock B = 3.75%
ROR for bond = 6.77%

Stock A and B have a tie for the lowest ROR

so that’s why the answer is choice 1) Stock A and Stock B

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2. _______ is a division of a school system below first grade. It could be half-day or full-day, and the curriculum varies from developmental to academic. A. Nursery school B. Preschool C. Home school D. Kindergarten the answer is kindergarten

In a residential solar thermal system, called the Solar Heating System, the solar panels are of the Solar Thermal Collector type, which have the function of capturing the thermal energy of the solar radiation and transferring it to the water, heating it.
This water will be stored in a thermal reservoir, which will maintain its temperature until the moment of use.
The size of the reservoir and the area of solar thermal collectors (solar heating plates) required for the solar heating system vary according to the amount of hot water used in the residence.
This is simple to calculate after an interview with the residents, where the consumption profile will be studied according to the habits of bathing, washing utensils, clothes, etc.

In a residential solar photovoltaic generator system the solar panels are of the photovoltaic module type, consisting of photovoltaic solar cells that transform solar radiation into direct current electric energy.
For the operation of an on-grid photovoltaic solar system (connected to the grid) it is necessary to use a grid-tie inverter, which converts the energy generated into continuous currents by the photovoltaic solar panels into current electric energy Alternating.
The grid-tie inverter is then connected to the general picture of the residence, where it is in charge of mixing the solar energy (already in alternating current) with the power of the public network, allowing to use it in any apparatus or electrical equipment.

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Kate took a test and she got a grade between 80% and 95%, inclusive. What is the greatest percent error she could have?

No, the events “brown hair” and “brown eyes” are not  independent.

Step-by-step explanation:

The table that represents the  hair and eye colors of thirty students of the fifth grade are given in table as:

Brown hair          Blonde hair              Total

Green eyes           9                       6                               15

Brown eyes          10                       5                              15

Total                     19                        11                             30

No, the events  “brown hair” and “brown eyes” are not independent.

Since, two events A and B are said to be independent if:

P(A∩B)=P(A)×P(B)

where P denotes the probability of an event.

Here we have:

A= students having brown hair.

B= students having brown eyes.

A∩B= students having both brown hair and brown eyes.

Now,

P(A)=19/30  (ratio of addition of first column to the total entries)

P(B)=15/30  ( ratio of addition of second row to the total entries)

Also,

P(A∩B)=10/30

Now as:

P(A∩B) ≠ P(A)×P(B)

Hence, the two events are not independent.

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Fifteen percent of the students in seventh grade at Western Middle School have perfect attendance. There are 220 students in seventh grade. How many have perfect attendance?

Fifteen percent of the students in seventh grade at Western Middle School have perfect attendance. There are 220 students in seventh grade. How many have perfect attendance?

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Which sentence uses italics or quotation marks correctly? A. O. Henry’s short story “The Cop and the Anthem” is both funny and sad. B. Amigo Brothers has been included in this collection of short stories. C. They enjoyed reading Thank You, M’am, a short story by Langston Hughes. D. “Seventh Grade” by Gary Soto is a short story about the first day of school. Which sentence uses italics or quotation marks correctly? A. In 1883, the “Orient Express” began railroad trips from Paris to Istanbul. B. I have a ticket for the Crescent passenger train, which will take me all the way to New Orleans. C. The “Flying Scotsman” was a luxury express train with a restaurant and a cinema coach. D. Beginning in 1936, the Super Chief passenger train ran from Chicago to Los Angeles. Which sentence uses italics or quotation marks correctly? A. As Mom cooks breakfast, she hums one of her favorite songs, Oh, What a Beautiful Mornin’. B. My baby brother already knows songs like “Twinkle, Twinkle Little Star.” C. I really like that song called “Do You Believe in Magic?” D. Dad makes me laugh when he sings the Elvis Presley song “Hound Dog.” Which sentence uses italics or quotation marks correctly? A. Even though it made him sad, he enjoyed reading Hans Christian Andersen’s short story The Little Match Girl. B. In April 1912, the Titanic struck an iceberg and sank in the North Atlantic Ocean. C. Here is the current issue of the magazine Sports Illustrated for Kids. D. The main newspaper in New Orleans is called “The Times-Picayune.” Which sentence uses italics or quotation marks correctly? A. My little brother just saw the movie “101 Dalmatians” for the first time. B. This sports magazine has a funny article titled “Top Ten Team Mascots.” C. In the chorus concert, we’re singing the song titled Don’t Fence Me In. D. The first spacecraft to travel to Saturn was the Pioneer 11 in 1979. Which sentence uses italics or quotation marks correctly? A. I really enjoyed reading Lewis Carroll’s book Alice’s Adventures in Wonderland. B. Who painted “Starry Night,” Van Gogh or Cezanne? C. Suzanne recited Winter Time, a short poem by Robert Louis Stevenson. D. My parents saw the Metropolitan Opera Company perform The Magic Flute on Saturday night. Which sentence uses italics or quotation marks correctly? A. Clément Ader piloted his steam-engine powered airplane named “Éole.” B. I don’t read all the newspaper, but I do read the editorials in the Washington Post. C. Ms. Franz recommends Walter Lord’s book titled “A Night to Remember.” D. One of Michelangelo’s most famous sculptures is the Pieta. Which sentence uses italics or quotation marks correctly? A. Vanessa looked up several articles in the Journal of the American Medical Association. B. I get a peaceful feeling when I look at Monet’s painting titled Water Lilies. C. Shakespeare’s “Romeo and Juliet” is a play that has been made into a movie and an opera. D. I was inspired by the story told in this book, “Washington at Valley Forge.” Which sentence uses italics or quotation marks correctly? A. Composers Richard Rodgers and Oscar Hammerstein wrote the music for the Broadway play The Sound of Music. B. My favorite song from the musical is Do-Re-Mi, which is sung by Maria and all of the von Trapp children. C. The musical is based on Maria von Trapp’s book, The Story of the Trapp Family Singers. D. The Academy Award for Best Picture in 1965 went to the musical movie “The Sound of Music.”

March 4, 1933, was perhaps the Great Depression’s darkest hour. The stock market had plunged 85% from its high in 1929, and nearly one-fourth of the workforce was unemployed. In the cities, jobless men were lining up for soup and bread. In rural areas, farmers whose land was being foreclosed were talking openly of revolution. The crowd that gathered in front of the Capitol that day to watch Franklin D. Roosevelt’s Inauguration had all but given up on America. They were, a reporter observed, “as silent as a group of mourners around a grave.”
Roosevelt’s Inaugural Address was a pitch-perfect combination of optimism (“The only thing we have to fear is fear itself”), consolation (the nation’s problems “concern, thank God, only material things”) and resolve (“This nation asks for action, and action now”). The speech won rave reviews. Even the rock-ribbed Republican Chicago Tribune lauded its “dominant note of courageous confidence.” F.D.R. had buoyed the spirits of the American people — and nearly 500,000 of them wrote to him at the White House in the following week to tell him so.
Hours after the Inauguration, Roosevelt made history in a more behind-the-scenes way. He gathered his Cabinet in his White House office and had Justice Benjamin Cardozo swear them in as a group, the first time that had ever been done. F.D.R. joked that he was doing it so they could “receive an extra day’s pay,” but the real reason was that he wanted his team to get to work immediately.
And that team came through brilliantly. In the next 100 days — O.K., 105, but who’s counting? — his Administration shepherded 15 major bills through Congress. It was the most intense period of lawmaking ever undertaken by Congress — a “presidential barrage of ideas and programs,” historian Arthur Schlesinger Jr. observed, “unlike anything known to American history.”

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What is the conflict in the passage? Jason’s Book Jason stood in the bookstore. On the shelf was his favorite author’s latest book. Jason had been waiting for this book for a long time. He checked his pockets. He had just enough money to buy the book. But Jason was also invited to his friend Percy’s birthday party this weekend. Percy and Jason had been friends for five years, ever since the second grade. Jason couldn’t possibly turn up at Percy’s party without a gift. Percy wanted a new Superman action figure, and Jason had been saving up for that. He would feel terrible if he disappointed Percy. But he also wanted the book. Jason didn’t know what to do.

What is the conflict in the passage? Jason’s Book Jason stood in the bookstore. On the shelf was his favorite author’s latest book. Jason had been waiting for this book for a long time. He checked his pockets. He had just enough money to buy the book. But Jason was also invited to his friend Percy’s birthday party this weekend. Percy and Jason had been friends for five years, ever since the second grade. Jason couldn’t possibly turn up at Percy’s party without a gift. Percy wanted a new Superman action figure, and Jason had been saving up for that. He would feel terrible if he disappointed Percy. But he also wanted the book. Jason didn’t know what to do.

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HELPPP! ill FAIL my grade if i dont get this right PLEASE HURRY! illl give u all my points IDCC! Find f(-10). f(x) = 7x – 5 A) -75 B) -65 C) 65 D) 90 Gr

B )The amount of interest accrued on the second account is double the amount of interest accrued on the first account.

Step-by-step explanation:

A sum of money is invested at 4% for 3 years and accrues \$168 in interest.

Lets find the principle.

The formula for simple interest is =

p = ?

i = 168

r = 4%

t = 3

Now putting these values in the formula;

p = \$1400

The same sum of money is invested in a second account at 6% for 4 years.

So, interest will be =

I = \$336

Difference between both interests = dollars

We can see, that the second account gives double amount of \$168.

Now, the true statement is :

B )The amount of interest accrued on the second account is double the amount of interest accrued on the first account.

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AYSO has 18 8th grade boys teams this year, but this a 28% (rounded to the nearest whole number) decreased from the prior year. How many 8th graders teams were there last year?

Let the unknown value be ‘x’

Consider the three consecutive multiples of 5 as ‘x’, ‘(x + 5)’ and ‘(x + 10)’

First number = x
Second number = (x + 5)
Third number = (x + 10)

Using the above statement, “The square of the third number, decreased by 5 times the second number = 25 more than twice the product of the first two numbers,” let us form an equation

(x + 10)² – 5(x + 5) = 25 + (2 (x) (x + 5) )
x² + 20x + 100 – 5x – 25 = 25 + 2x² + 10x
x² + 15x + 75 = 2x² + 10x + 25

Bringing everything to one side,

0 = 2x² + 10x + 25 -x² -15x -75
or
2x² + 10x + 25 -x² -15x -75 = 0
x² – 5x – 50 = 0

Factorising the above equation,
(x – 10) (x + 5) = 0 ⇒ x = 10 or x = -5

If x = 10, then the three consecutive numbers are 10, 15, 20.

Let us check if it follows the above statement!

Square of the third number, decreased by 5 times the second number = 25 more than twice the product of the first two numbers
20² – (5 x 15) = 25 + (2 x (10 x 15))
400 – 75 = 25 + (2 x 150)
325 = 25 + 300
325 = 325

Now let us try with x = -5. The three consecutive numbers are -5, 0, 5

Let us check if it follows the above statement.

Square of the third number, decreased by 5 times the second number = 25 more than twice the product of the first two numbers
5² – (5 x 0) = 25 + (2 x (-5 x 0))
25 – 0 = 25 + (2 x 0)
25 = 25 + 0
25 = 25

Hence both x = 10 and x = -5 are correct

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Whats 18÷19 ok im only in grade 5 so

Whats 18÷19 ok im only in grade 5 so

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A school principal wants to observe how classroom area has an effect on classroom learning. The principal randomly chooses a group of students of the same age and grade, and places them in a classroom with an area of 400 square feet. The test scores of the class are recorded and analyzed at the end of the semester.

Diameter=22 inches

Step-by-step explanation:

It is given that The area of a circle is approximately 379.94 square inches, then using the formula for the area of the circle, we get

Substituting the given values, we have

Now, the diameter of the circle is given as:

Putting the value of r, we have

Thus, the diameter of the circle is 22 inches.

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9th grade algebra homework help?? In the formula h(t)=1/2gt^2+v0t+h0, v0 is the ( 1 )______________ and h0 is the (2)__________________________________.

9th grade algebra homework help?? In the formula h(t)=1/2gt^2+v0t+h0, v0 is the ( 1 )______________ and h0 is the (2)__________________________________.

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Program should allow for user to enter students name and his four test scores it should calculate and display the average and letter grade

A) Playing a decent game of table tennis (Ping-Pong) – This is solvable by computers.

B) Driving in the center of Cairo, Egypt – This is solvable by computers.

C) Buying a week’s worth of groceries at the market – This is not solvable by computers.

D) Buying a week’s worth of groceries on the Web – This is solvable by computers.

E) Playing a decent game of bridge at a competitive level – This is solvable by computers.

F) Discovering and proving new mathematical theorems – This is not solvable computers.

G) Writing an intentionally funny story – This is not solvable by computers.

H) Giving competent legal advice in a specialized area of law – This is not solvable by computers.

I) Translating spoken English into spoken Swedish in real time – This is solvable by computers.

J) Performing a complex surgical operation – This is not solvable by computers.

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8.01)Ben takes a random sample of 25 students in his seventh-grade class and finds that 85% of the sample prefers math over science. There are 150 students in the seventh grade. Based on the sample proportion, about how many students in the seventh grade would be expected to prefer math over science? 25 85 150 128 08.01)Carla wants to know how many students in her school enjoy watching reality TV shows. She asks all 22 students in her science class and finds that 40% of her classmates enjoy watching reality TV shows. She claims that 40% of the school’s student population would be expected to enjoy watching reality TV shows. Is Carla making a valid inference about her population? No, it is not a valid inference because she asked all 22 students in her science class instead of taking a sample from her music class No, it is not a valid inference because she asked all 22 students in her science class instead of taking a sample of the students in her school Yes, it is a valid inference because she asked all 22 students in her science class Yes, it is a valid inference because her classmates make up a random sample of the students in the school

60 feet

Step-by-step explanation:

The area of the school is

165(300) = 49500 square feet.

The area of the parking lot with the school is

(165+75)(300+75) = 240(375) = 90000 square feet.  This means the area of just the parking lot is

90000-49500 = 40500 square feet.

The area of the new expanded lot will be doubled; this means it will be

2(40500) = 81000 square feet.  Adding back the area of the school, this means the total lot will be

81000+49500 = 130500 square feet.

The width will be 375+x and the length will be 240+x; this gives us

130500 = (375+x)(240+x)

Multiplying the binomials gives us

130500 = 90000+375x+240x+x²

130500 = 90000+615x+x²

To solve this, we first set it equal to 0.  We do this by subtracting 130500 from each side:

130500-130500 = 90000+615x+x²-130500

0 = x²+615x-40500

We will use the quadratic formula:

Substituting our values for a, b and c,

We do not use negative numbers for measurement, so x = 60.