Answer:
option (c) 4 feet.
Explanation:
To calculate the height needed to reach the desired volume of 168 ft³, we can use the formula for the volume of a rectangular prism, which is given by:
Volume = Length x Width x Height
Given that the length is 7 feet and the width is 6 feet, we can substitute these values into the formula:
168 = 7 x 6 x Height
Now, we can solve for Height by dividing both sides of the equation by (7 x 6), like this:
168 / (7 x 6) = Height
168 / 42 = Height
Height ≈ 4 feet
So, the height needed to reach the desired volume of 168 ft³ is approximately 4 feet. Therefore, the correct answer is option (c) 4 feet.