Answer:
D is your correct answer
Explanation:
Well first things first if we want to simplify with a base and an exponent we can use product of two powers with like bases.
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Example/model of product of two powers with like bases:
x^m + n (adding the exponents)
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If we add those two exponents you get 3^4. Then if you do 3 x 3 x 3 x 3 = ?
What do you get? You get 81. Hope this helpss! Good luck!!