Set 4: Linear Functions (Beginner)

**Choice B is the best answer.** f(4) = 9(4) = 36

Explanation

Answer: B

PROBLEM

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

✓ Correct

Detailed Explanation

Choice B is the best answer. f(4) = 9(4) = 36

Why others are wrong:

A: 45 is incorrect because it does not satisfy the equation.

C: 13 is incorrect because it does not satisfy the equation.

D: 27 is incorrect because it does not satisfy the equation.