Question

Please help with multiple choice question

The function f(x) = 2x + 5 represents Ken’s earnings working x hours as a waiter. On
3 separate days, he works 2, 8, and 14 hours, representing the domain of the function.
What is the range of f(x)?
a. {4, 16, 28}
b. {–1, 11, 23}
c. {14, 26, 38}
d. {9, 21, 33}

Answer 1

D: {9, 21, 33}

Explanation:

Ken worked 2, 8 and 14 hours on 3 separate days.

For working 2 hours, his earnings were f(2) = 2(2) + 5, or 9;

For working 8 hours, his earnings were f(28) = 2(8) + 5, or 21; and

For working 14 hours, his earnings were f(14) = 2(14) + 5, or 33

Thus, the range of this function for the days given is {9, 21, 33} (Answer D)