ACT 2019 June(72F) Math Question 4 Explanation - ACT Helper

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2019 June(72F) Math Question 4
Exponents, Radicals, & Scientific Notation
- Exponent Expressions
Choice J
$$3x^{9}\cdot 5x^{9}$$ $$=3\times5\times x^{9+9}$$ $$=15x^{18}$$
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