Caleb’s aunt and uncle asked Caleb to help his uncle lay cement for the foundation of their new home.

a. After the first 15 minutes of laying down the cement, Caleb has used 1 3of the bag of cement. At what rate does Caleb lay cement in bags per hour?

b. Caleb’s uncle works faster than Caleb. He uses 3 bags for every 2 bags Caleb uses. Is the relationship proportional? Explain your reasoning using a graph on a coordinate plane.

c. What does the point (0,0) on the graph represent in terms of the situation?

d. Using the graph, show how many bags of cement Caleb would use in the time it takes his uncle to use 18 bags.