ACT 2019 April(Z15) Math Question 11 Explanation - ACT Helper

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2019 April(Z15) Math Question 11
Algebraic & Function Expressions
- Nested Functions
Choice B
$f (x) = 5 \cdot 2^{x}$ $g (x) = 10 x$ $f (3) = 5 \cdot 2^{3} = 5 \cdot 8 = 40$ $g (3) = 10 \cdot 3 = 30$ $\Rightarrow f (3) - g (3) = 40 - 30 = 10$
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