Question

A maintenance company charges a monthly fee to clean office buildings. The fee is based on the number of employees in the office. An office with 15 employees pay $150 per month while an office with 27 employees pays $246 per month. Which of the following functions represents the relationship between the monthly cost and x, the number of employees

Answer 1

• f(x) = 8x + 30

Explanation:

Rate of change:

• (246 - 150)/(27 - 15) =
• 96/12=
• 8

8*15 = 120, so one off fee is:

• 150 - 120 = 30

Therefore the function is:

• f(x) = 8x + 30

Correct choice is B