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3-19.

Which of the expressions below are equivalent to $16x^8$? Make sure you find all the correct answers!

1. $(16x^4)^2$

$(16x^4)(16x^4)$

$256x^8$

1. $8x^2·2x^6$

$16x^8$

1. $(2x^2)^4$

$(2x^2)(2x^2)(2x^2)(2x^2)$

$16x^8$

1. $(4x^4)^2$

$(4x^4)(4x^4)$

$16x^8$

1. $(2x^4)^4$

$(2x^4)(2x^4)(2x^4)(2x^4)$

1. $\left(\frac{1}{16}x^{-8}\right)^{-1}$

A negative exponent means that the fraction and the variable must be reciprocated (flipped).