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3. 147  4.

Step-by-step explanation:

3. Volume of a square pyramid = ×

Variables:

V = volume

x = base edge length

h = height

V =  ×

x = 7 ft

h = 9 ft

Plug the values in the equation:

V = ×

V = 49 × 3

V = 147

4. Volume of cone =

Variables:

V = volume

r = radius

h = height

V =

r = 8ft /2 = 4 ft (radius is half of the diameter)

h = 10 ft

V =  

V = × 16 ×

V =

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