Please help me with this calc hw.

(5) The graph below shows the velocity (miles per hour) vs. time (hours) of your car for the first five hours after leaving campus for home: V (mph) 4 1 t (hours) a. [4 pts] Write an expression (using an integral sign) that would represent the shaded area on the plot. b. [2 pts] What would be the units associated to that shaded region. c. [4 pts] Suppose that your car can travel about 27 miles per gallon of fuel and you wanted to estimate how much fuel you used on your trip. Explain why multiplying your integral from part a. by 27 would be incorrect