The volume of a rectangular slab of concrete needs to exceed 72 cu. ft. If the length is 12 feet and the width is 8 feet, how thick does the concrete slab need to be?

Answer 1

12*8*thickness>72

Answer 2

would I replace the word "thickness" with 96? 12*8*96 > 72?

Answer 3

(12 * 8)t = 72
96t = 72
t = 72/96
t = 0.75 inches

Answer 4

9” not .75” its cubic feet not cubic inches.