the function f(r) gives the area of a circle radius r. it can be written in equation form as f(r) = 3.14 r2. what is f(3)?
To find f(3), we substitute 3 for r in the equation f(r) = 3.14r^2:
f(3) = 3.14(3)^2
= 3.14 * 9
= 28.26
Therefore, f(3) = 28.26.