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?

12*8*thickness>72

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

(12 * 8)t = 72

96t = 72
t = 72/96
t = 0.75 inches

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

To find out the thickness of the concrete slab, we can use the formula for the volume of a rectangular prism:

Volume = Length x Width x Height

We are given the length (L) as 12 feet and the width (W) as 8 feet. We need to find the height (H) or thickness of the slab.

Now, let's substitute the given values into the formula:

Volume = 12 ft x 8 ft x H

Since the volume needs to exceed 72 cu. ft., we can write this as:

12 ft x 8 ft x H > 72 cu. ft.

To solve for H, we need to rearrange the equation:

H > 72 cu. ft. / (12 ft x 8 ft)

Simplifying the right side of the equation:

H > 6 cu. ft.

Therefore, the concrete slab needs to have a thickness greater than 6 feet in order for the volume to exceed 72 cu. ft.