Question

not sure how to do this


The function f(r) gives the area of a circle with radius r. It can be written in equation form as f(r) = 3.14r2. What is f(3

Answer 1

The answer is B 28.26. You just substitute 3 for r and then simplify. Hope this helped!

Answer 2

Answer:  The correct option is (B) 28.26.

Step-by-step explanation:  Given that the function f(r) gives the area of a circle with radius r. It can be written in equation form as follows :

$f(r)=3.14r^2.$

We are to find the value of f(3).

To find f(3), we must substitute r = 3 in the definition of f(r).

Putting r = 3 in the expression for f(r), we get

$f(3)=3.14r^2=3.14\times 3^2=3.14\times9=28.26.$  

Thus, the value of f(3) is 28.26.

Option (B) is CORRECT.