SOLUTION: Find the average rate of change of the function A(X)=piX^2, where A is the area of a circle with radius X as the radius changes from X=4 to X=7. The correct answer is one of the

Question 1198829: Find the average rate of change of the function A(X)=piX^2, where A is the area of a circle with radius X as the radius changes from X=4 to X=7.
The correct answer is one of the following. Which one is it?
A) 4pi
B) 7pi
C) 11pi
D) 16pi
Found 2 solutions by ikleyn, MathLover1:
Answer by ikleyn(52798) (Show Source): You can put this solution on YOUR website!
.

Calculate A(4); then calculate A(7), then get the average change as .

Happy calculations (!)

Everything in this assignment can be done mentally.

Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

where

find and

then

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