Answer:
Hourly fee = $15 per hour
Explanation:
Royce is taking violin lessons. The instructor charges an initial fee and an hourly fee. The amount Royce pays based on the length of his lesson is shown in the graph below.
To find out hourly fee , we use any two points from the given graph
Hourly fee is the slope of the line
LEts pick (2,52) and (3,67)
Slope =

Hourly fee = $15 per hour