Set 5: Linear Functions (Beginner)

**Choice D is the best answer.** f(5) = 3(5) - 9 = 6

Explanation

Answer: D

PROBLEM

If f(x) = 3x - 9, find f(5).

✓ Correct

Detailed Explanation

Choice D is the best answer. f(5) = 3(5) - 9 = 6

Why others are wrong:

A: 24 is incorrect because it does not satisfy the equation.

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

C: 0 is incorrect because it does not satisfy the equation.