Which equation is equivalent to 4 raised to the x plus 3 power is equal to 64 ?

Rewrite each side using base 2: 4^(x+3) = (2^2)^(x+3) = 2^(2x+6), and 64 = 2^6. So the equivalent equation is 2^(2x+6) = 2^6, which is choice C.

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