Rate of change or slope. Hope it helps.
Answer: I cant tell which one is a or b or c or d but ill say its b
So first write out the expression:

take two 10's from the top to cancel with the two 10's on the bottom.
3.9/1.3 is 3.
The answer is 3*10^3
The answer is : 10416.67ft^3
D, because there are several students that are in your school. There would be many different answers.