Answer:
C. 48 in.
Step-by-step explanation:
V = Bh = πr²h
8640π = π r² x 15
r² = 576
r = 24
diameter = 24 x 2 = 48
(f+g)(-1)
=f(-1)+g(-1), so;
f(x)=3x+8
f(-1)=3(-1)+8
f(-1)=-3+8
f(-1)=5
g(x)=6x+6
g(-1)=6(-1)+6
g(-1)=-6+6
g(-1)=0
Finally:
f(-1)+g(-1)
=5+0
=5. As a result, (f+g)(-1) is 5. Hope it help!
