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4

Set 4: Function Notation (Beginner)

Explanation

Answer: B

PROBLEM

If f(x) = 2x + 9, find f(4).

If f(x) = 2x + 9, find f(4).

A.

19

B.

17

✓ Correct
C.

14

D.

20

Detailed Explanation

Choice B is the best answer. f(4) = 2(4) + 9 = 8 + 9 = 17

Why others are wrong:
A: 19 is incorrect because it does not satisfy the equation.
C: 14 is incorrect because it does not satisfy the equation.
D: 20 is incorrect because it does not satisfy the equation.
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