please help. I dont understand how to do this.

Answer:
draw a graph
Step-by-step explanation:
take some graph paper and draw a graph. In order to figure out this question you must draw a graph and choose one of the following, if you don't know how to draw a graph look at the photo I put to show you what a graph looks like.
Answer:
a. graph attached
b. C
c. $28
Step-by-step explanation:
a. graph attached
b. C
c. $28