Answer:
Step-by-step explanation:
<h2>C A L C U L A T I O N S</h2>
Hello There!
Well all of your answer options are the same so i suppose they are all right.
Hope This Helps You!
Good Luck :)
2.5 because if you move x to the other side of the equation you will get y=2.5x, and the constant of proportionality is what x is multiplied by, in this case, it's 2.5.
Remark
Many calculators have a key that will do this in one step. Mine is one of them. So let's start with the answer and then we'll do it the long way.
9C3 = 84. You put it into your calculator as 9 2nF nCr 3 =
Solution

3*4*7 = 84 which is what you set out to show.