To find the length of a right rectangular prism, we can use the formula for the volume of a rectangular prism:
In this case, we know the volume (90), width (3), and height (5). We can set up the equation:
Now, we can simplify the equation. First, calculate
Now we have:
To find the length, divide both sides by 15:
Calculating that gives:
Thus, the length of the right rectangular prism is