The height of the prism is 
Explanation:
It is given that the area of the cross section of the rectangular prism is 45 square inches.
Length of the rectangular prism is 
Width of the rectangular prism is 
To determine the height of the prism, let us substitute these values in the formula
, we get,

Multiplying the terms within the bracket, we get,

Adding the terms within the bracket, we have,

Dividing both sides by 20, we get,

Thus, the height of the rectangular prism is 