Answer:
the S.A of the rectangular prism is 880in^2
Explanation:
to find the surface area of a rectangular prism the formula is S.A.=2(l*w+l*h+w*h)
2(20*15+20*4+15*4)
the length is l the width is w and the height is h. You can assume the value of these as you like but for this I've assumed 20in as length 15in as width and 4in as height.
2(20*15+20*4+15*4)=880in^2