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Which monomial is a perfect cube? a. 1×10 b. 8×8 c. 9×9 d. 27×15

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Hello,

I think your “x” is the “multiply” sign
Use “*” (star-like programmers)

64 = 8 * 8 = 2 ^ 3 * 2 ^ 3 = 2 ^ (3 + 3) = 2 ^ 6 = (2ยฒ) ^ 3 = 4 ^ 3

Answer B.