Answer:
The height of the rectangular prism is 5in
Explanation:
 
To calculate the height of a rectangular prism we have to use the following formula: 
v = volume = 30 in³
w = width = 3 in
l = length = 2in
h = height 
 
v = w * h * l 
we replace the values that we know 
 
30 in³ = 3 in * 2 in * h
30 in³ = 6 in² * h
30 in³ / 6 in² = h
5in = h
 
The height of the rectangular prism is 5in