To find cirfumfrence we use the formula C =

Soooo

= 3.14
r = 40 inches
So now we plug it in :P
C = 2 x 3.14 x 40 = 251.2
answer = B.) 251.2 inches
Answer:
18 since f(3)=18
Step-by-step explanation:
f(x)=2x^2 is give as our function. To find f(3) we need to replace x with 3.
f(3)=2(3)^2 (Replaced x with 3.)
f(3)=2(9) (Did 3^2 which was 3*3=9)
f(3)=18 (Did 2(9) which was 18)