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Answer:
Sam is correct.
Step-by-step explanation:
(8^4)^5 = 8^(4*5) = 8^20
(7^3)^9 = 7^(3*9) = 7^27
answer
Sam's Work: (8^4)^5 (7^3)^9 = (8^4)⋅^5 7^3⋅^9 = 8^20 7^27