Set 2: Linear Functions (Beginner)

**Choice D is the best answer.** f(15) = 15 - 6 = 9

Explanation

Answer: D

PROBLEM

If f(x) = x - 6, find f(15).

✓ Correct

Detailed Explanation

Choice D is the best answer. f(15) = 15 - 6 = 9

Why others are wrong:

A: 90 is incorrect because it does not satisfy the equation.

B: 21 is incorrect because it does not satisfy the equation.

C: 6 is incorrect because it does not satisfy the equation.