Answer:
14
f(x) = 7
-7^2 + 9(7)= -49 + 63 = 14
7.14
Step-by-step explanation:
4 pi
diameter = 2r
4 =2r
r =2
area = pi × (r)^2
= pi × 2^2
= 4 pi
The choice;
I hope I helped you^_^
