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Brainly.com What is your question? High School Mathematics 5+3 pts Which of the following situations could be represented with the given system of equations? 0.1x+0.6y=0.4(5) x+y=5 A. Eunice needs to combine solutions of 0.1M HCl and 0.4M HCl to produce 5L of 0.6M hydrochloric acid (HCl). B. Eunice needs to combine solutions of 0.1M HCl and 0.6M HCl to produce 5L of 0.4M hydrochloric acid (HCl). C. Eunice needs to combine solutions of 0.4M HCl and 0.6M HCl to produce 5L of 0.1M hydrochloric acid (HCl). D. Eunice needs to combine solutions of 0.1M HCl and 0.6M HCl to produce 4L of 0.5M hydrochloric acid (HCl).

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Answered by answersmine AT 22/10/2019 – 02:26 AM

In the equations, the molarity is given as coefficients, x and y are volumes of HCl of different concentrations.  Therefore on the right hand side, molarity is 0.4, volume is 5 L.
The correct answer has a product of 0.4M and 5L.

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(20 pts) What is the range of the relation? Coordinate grid with labeled points at (negative one, negative two), (negative four, negative three), (negative two, zero), (two, two) A. {–4, 4} B. {–4, –2, –1, 0, –2} C. {–3, –2, 0, 2} D. {–4, –2,–1, 2}

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(20 pts) What is the range of the relation? Coordinate grid with labeled points at (negative one, negative two), (negative four, negative three), (negative two, zero), (two, two) A. {–4, 4} B. {–4, –2, –1, 0, –2} C. {–3, –2, 0, 2} D. {–4, –2,–1, 2}

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PLEASE HELP ILL GIVE 40 PTS There are 20 alligators in the swamp. Each year, the number of alligators increases by 25%. There are 25 crocodiles in the swamp. Each year, 10 new crocodiles join the swamp. Part A: Write functions to represent the number of alligators and crocodiles in the swamp throughout the years. (4 points) Part B: How many alligators are in the swamp after 4 years? How many crocodiles are in the swamp after the same number of years? (2 points) Part C: After approximately how many years is the number of alligators and crocodiles the same? Justify your answer mathematically. (4 points)

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The polinomials only can have positive whole exponents, that is: 1, 2, 3, 4, 5, 6, … (you can include 0 also, because it iis the independent term).

So, if you are told that one term of the polynomial is 9 x ^ (negative something), it is necessary that the number after the negative sign be negative, given that negative times negative is positive.

Therefore, the only possible option from the answer choices is the option 3) -9.

Answer: 3) – 9

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What happens to an animal cell when placed in a hypotonic solution (2 pts)?

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What happens to an animal cell when placed in a hypotonic solution (2 pts)?

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Which of the following characteristics do all of the outer planets have in common? ________________________________________________________________ They are small and solid. They rotate slowly and are large and solid. They have many moons. They rotate quickly and are large and gaseous. _______________________________________ 12 pts

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Like before we can get the position function, x(t), by integrating the acceleration, which in this case is gravity g = 9.81m/s². We will assign the downward direction as negative x in this problem and let the ground be x=0. Integrating once gives velocity: V(t) = -9.81t +17.
Integrating this to get position x(t) gives
x(t) = (-9.81/2)t² +17t = 4.905t² +17t
We need to solve this quadratic equation for the time t when the position x(t)=0 because this is when the ball hits the ground. Using the quadratic formula gives 
t= 0 and 3.466
All quadratic formulas have two roots (answers)  Here the 0 root just means the  ball was at the ground at t=0 (which it was because that’s where it was thrown from)  The other root is of interest because that’s when it lands back on the ground and is our answer to part a.
t = 3.466sTo get part b we only now need to plug in half of our time to the position function.  Half because it went up for half the time and down for half. This gives
x(t) = 4.905(3.466/2)² +17(3.466/2) = 44.19m

part c is asking how long it takes to get to the highest point.  We already found that out in part b.  It is half the time from part a: t = 1.733s 

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Samarium has a half-life of approximately 106 billion years. If you found a sample of samarium from the beginning of Earth’s history, approximately 4.6 billion years ago, which would be the best approximation of the amount of parent isotope left in the rock? a Nearly 100 percent b 50 percent c 25 percent d Less than 10 percent Brainliest for the correct answer and 20 pts~!

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The correct answer is B) Rock-forming materials are deposited in horizontal layers, though they may be tilted later.  

The option that is a correct principle of relative-age dating is “Rock-forming materials are deposited in horizontal layers, though they may be tilted later.”

When using relative dating, scientists consider six principles to determine the relative age of the formation. These are the Principle of Superposition, the Principle of Original Horizontality, the Principle of Lateral Continuity, the Principle of Cross Continuity, the Principle of Inclusions, and the Principle of Fossil Succession.

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