📅2026 FAFSA Deadline: June 30, 2026→
7

Set 3: Function Notation (Beginner)

Explanation

Answer: B

PROBLEM

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

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

A.

48

B.

45

✓ Correct
C.

43

D.

47

Detailed Explanation

Choice B is the best answer. f(9) = 4(9) + 9 = 36 + 9 = 45

Why others are wrong:
A: 48 is incorrect because it does not satisfy the equation.
C: 43 is incorrect because it does not satisfy the equation.
D: 47 is incorrect because it does not satisfy the equation.
← PreviousNext →