ACT 2021 December(E23) Math Question 21 Explanation - ACT Helper

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2021 December(E23) Math Question 21
Exponents, Radicals, & Scientific Notation
- Exponent Expressions
Laws of exponents
Choice A
$- \frac{1}{81} = - 3^{x}$
$- \frac{1}{(3)^{4}} = - 3^{x}$
$- (3)^{- 4} = - 3^{x}$
$∴ x = 4$
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