Chantel wanted to add fish to her new fish tank. The pet store recommended that each fish needs 0.5 cubic feet of water for each fish. Chantel wants to put 7 fish in her tank and the tank is 2.5 feet long and 0.5 feet deep. How high should Chantel fill the water in the tank?

2.8 feet high

Step-by-step explanation:

The volume of water required for the 7 fish is ...

(7 fish) (0.5 ft³/fish) = 3.5 ft³

The height of the water required is computed using the formula for the volume of a cuboid:

volume = length * depth * height

3.5 ft³ = (2.5 ft) * (0.5 ft) * height

height = (3.5 ft³) / (1.25 ft²) = 2.8 ft

Chantel should fill the water in the tank to a height of 2.8 feet.