Answer:
2.5 ft
Step-by-step explanation:
A rectangular prism's volume is given by it's base area multiplied by it's height:
[tex]V = A_b * h[/tex]
In this problem, we are given the volume and the base area, so we need to solve for h:
[tex]h = \frac{V}{A_b}[/tex]
[tex]h = \frac{15}{6} = 2.5[/tex]
The units are feet, so the answer is 2.5 ft.