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What is the surface area of the prism?

Answer:
=234 mm^2
Step-by-step explanation:
The surface area of a rectangular prism is given by
SA = 2 (lw +lh +hw) where l is the length, w is the width and h is the height
SA = 2 ( 15*3 + 15*4 + 3*4)
= 2( 45+60+12)
= 2(117)
=234 mm^2