To find the volume of a right rectangular prism, you can use the formula:
\[ \text{Volume} = \text{Length} \times \text{Width} \times \text{Height} \]
For Keysha's container:
- Length = 7.5 feet
- Width = 5 feet
- Height = 3 feet
Now, substitute the values into the formula:
\[ \text{Volume} = 7.5 , \text{ft} \times 5 , \text{ft} \times 3 , \text{ft} \]
Calculating this step-by-step:
- \(7.5 \times 5 = 37.5\)
- \(37.5 \times 3 = 112.5\)
So, the volume of the container is:
\[ 112.5 , \text{ft}^3 \]
Thus, the correct answer is 112.5 ft.³ or 112.5 feet cubed.