Set 3: Function Notation (Beginner)

**Choice B is the best answer.** f(4) = 1(4) + 9 = 4 + 9 = 13

Explanation

Answer: B

PROBLEM

If f(x) = 1x + 9, find f(4).

✓ Correct

Detailed Explanation

Choice B is the best answer. f(4) = 1(4) + 9 = 4 + 9 = 13

Why others are wrong:

A: 11 is incorrect because it does not satisfy the equation.

C: 10 is incorrect because it does not satisfy the equation.

D: 12 is incorrect because it does not satisfy the equation.