ANSWER :
a. 0.25 miles per gallon
b. 4
EXPLANATION :
From the graph, we can select the point (50, 200) in which 50 miles can be traveled by consuming 200 gallons.
a. Solve for the miles per gallon :
b. The slope of the graph is the difference of y over the difference of x
Using the same point with the origin (0, 0)
That will be :