Step-by-step explanation:
There is 6 sides on a rectangular prism
the top would be 6 x 4 = 24 and same for the bottom then I'll do the left amd right sides those are 20 and the front and back sides are 30 so I add all the sides so...
30 + 30 + 20 + 20 + 24 + 24 = 148
so 148 is our answer
