1. How many cubic yards of concrete are needed to pour a concrete slab 24 feet long, 14 feet wide, and 8 inches thick?

V=Ah

A=LW

A=24 * 14= 336 ft^2

V= 336 * h

V= 336ft^2 * .67 ft =225.12 ft^3

225.12 cubic feet divided by 27= 8.34 cubic yards

2. How many cubic feet of concrete are needed to pour 4 cylindrical pillars 6 feet high with a diameter of 10 inches?

(pi) (r^2) (h)

3.14 X 25 X 72 in =5652 in^2

5652 X 4=22608 in^2

22608 / 1728= 13.08 cubic feet