If $f: \mathbb{N} \to \mathbb{N}$ is defined by $f(x) = 2x + 1$, what is $f(5)$?
A$7$
B$9$
C$11$
D$10$
Answer & Solution
Correct answer: C. $11$
$f(5) = 2(5) + 1 = 11$.
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