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12-39.

Which of the following expressions are equivalent to $12x^6$ ? (Note: More than one answer is possible!)

$3\left(2x^3\right)^2$

$\left(6x^8\right)\left(2x^{-2}\right)$

$\left(144x^{12}\right)^{\frac{1}{2}}$

$\frac { 60 x ^ { 10 } y } { 5 x ^ { 4 } y }$

Answer (a-d):

All these expressions are equivalent to $12x^6$ .

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