28. Here the base is 7, raised to power 7, and that whole result is raised to power 4. The law (a^m)^n = a^(mn) applies for any base a. So the exponents multiply: 7 x 4 = 28. The expression simplifies to (7)^28.

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[(7)^7]^4 = (7)^?

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1. [(7)^7]^4 = (7)^?

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[(7)^7]^4 = (7)^?

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