A roofer charges $60 for the first hour of a service call and $20 per hour for each additional hour, as shown on the graph below.

Look at the above Roofer’s Prices graph and then answer the following questions.
Part A What is the slope of a line joining the points on this graph? Show your work or explain your answer.
Part B What does the slope represent?

c = 60 + 20 (t-1) = 20 t + 40

slope = $20 / hour

Unfortunately, I cannot see the graph you mentioned. It would be helpful if you could provide a description or explain the key points of the graph, so I can help you with the calculations and explanations for Part A and Part B.

To find the slope of a line on the graph, we need to calculate the change in the y-values (vertical) divided by the change in the x-values (horizontal).

Part A: Let's choose two points on the graph to calculate the slope. For example, let's choose the points (2, 100) and (7, 200).

Change in y-values: 200 - 100 = 100
Change in x-values: 7 - 2 = 5

Slope = (Change in y-values) / (Change in x-values) = 100 / 5 = 20

Therefore, the slope of the line is 20.

Part B: The slope represents the rate of change. In this case, it represents the additional cost per additional hour. The slope of 20 means that for each additional hour, the cost increases by $20.