To find the surface area of a rectangular prism you use the next formula:
[tex]SA=2lw+2wh+2lh[/tex]
l is length
w is width
h is height
For the given prism:
l= 7in
w=5in
h=3in
[tex]\begin{gathered} SA=2(7in)(5in)+2(5in)(3in)+2(7in)(3in) \\ SA=70in^2+30in^2+42in^2 \\ SA=142in^2 \end{gathered}[/tex]Then, the surface area of the given rectangular prism is 142 squared inches
