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Answer:
Step-by-step explanation:
Formula
SA = 2*L*w + 2*L*h + 2*h*w
Givens
L = 15
w = 5
h = 3
Solution
SA = 2*15*5 + 2*15*3 + 2*5*3
SA = 150 + 90 + 30
SA = 270 cm^2