Mike is pouring a two foot cement sidewalk around the perimeter of his swimming pool. His swimming pool measures 6 feet by 14 feet. If he plans for the sidewalk to be 9 inches deep, what volume of cement is needed for the sidewalk?

9 inches * 1 foot / 12 inches

= 3/4 feet deep

Area of the sidewalk:

= the sides of the pool * the width of the sidewalk + the corners of the sidewalk (width * width)

= 2 sides * 6 (feet / side) * 2 feet + 2 sides * 14 (feet / side) * 2 feet + 4 corners * (2 feet * 2 feet / corner)

= 12 feet * 2 feet + 28 feet * 2 feet + 4 * 2 feet * 2 feet

= 24 feet^2 + 56 feet^2 + 16 feet^2

= 96 feet^2

Volume:

= 96 feet^2 * 3/4 feet

= (96 * 3 / 4) feet^3

= (19 * 3) feet^3

= 57 feet^3