PLEASE NEED HELP ASAP

Answer:
288mm^2
Step-by-step explanation:
Formula: A=2(wl+hl+hw)
Answer: 2·(14·6+3·6+3·14)
2 • (84 + 3•6 + 3•14)
2 • (84 + 18 + 3•14)
2 • (84 + 18 + 42)
2 • 144 =
288mm^2
Press answer 2 on the question of the image you inserted