Question

A plumber charges a one-time fee for a service call plus a constant amount for each hour worked. The table shows the total amount charged by the plumber for different numbers of hours of work. Which statement below represents the plumber's charge per hour?
A) The plumber charges $45 for each hour worked.
B) The plumber charges $68 for each hour worked.
C) The plumber charges $90 for each hour worked.
D) The plumber charges $115 for each hour worked.

Answer 1

(1,115),(3,205)
slope = (205 - 115) / (3 - 1) = 90/2 = 45

the plumber charges $ 45 for each hr worked