A hair salon owner collected data comparing the length of an appointment in hours at the salon and the amount of money spent by the customer. Use the graph of the data to answer the questions.

A graph titled Hair Salon with the x axis labeled time in hours from 0 to 4 and the y axis labeled amount of money spent in dollars counting by 25 from to 0 to 225 with a line passing through the ordered pairs 1,30 and 1.5,45 and 1.75,50 and 2.5,75 and 3,90.

Part A: Determine the equation for the line of fit. Show all work and include all steps. (4 points)

Part B: Identify and interpret the slope in the context of this scenario. (3 points)

Part C: Demonstrate how to use your equation for the line of fit from Part A to predict the cost of a 6-hour hair salon appointment. Show all work and include all steps. (3 points)