Which function matches the ordered pairs shown in the table?

a) f( x ) = 15 x

c) f( x ) = -5 x 2

b) f( x ) = x - 6

d) f( x ) = x 4 + 4

x
-3
-2
-1
0
1

f(x)
-45
-20
-5
0
-5

The roof of a farm silo is the shape of a hemisphere and is made of sheet tin. if the diameter of the silo is 126.5 feet, how much sheet tin is needed to make the roof? (use π = 3.1416.)