9
Answer: DSet 1: Function Notation (Advanced)
Explanation
PROBLEM
If f(x) = 3x + 5 and g(x) = 1x + 1, find g(f(4)).
If f(x) = 3x + 5 and g(x) = 1x + 1, find g(f(4)).
A.
21
B.
20
C.
15
D.✓ Correct
18
Detailed Explanation
Choice D is the best answer. f(4) = 3(4) + 5 = 17. g(17) = 1(17) + 1 = 18
Why others are wrong:
A: 21 is incorrect because it does not satisfy the equation.
B: 20 is incorrect because it does not satisfy the equation.
C: 15 is incorrect because it does not satisfy the equation.