Answer:
SA = 510 in^2
Step-by-step explanation:
There are two options to this scenario, which is either individually finding the area of each shape and adding them together. Or substituting the length, width, and height into the surface area formula for a right rectangular prism. SA=2(wl+hl+wh)
given l=7, w=9, h=12. SA = 2(63+84+108)
2(255) = 510 in^2
or 2(7*9)+2(7*12)+2(9*12) = 510
