5. A student borrowed $2000 from his parents to buy a car. The student is paying back his parents $50 per week.
Which of the following equations represents the relationship between
x, the number of weeks the student has been paying back his
parents, and y, the amount of money left to pay back?
A. y = - 2000 - 50.x
B.
y = 2000 - 50.x
C.
y = 2000.x + 50
y = 2000x - 50
D.

See diagram.we use washers to get the area and we will be integrating with respect to xouter radius is the  distance between y = e^x and y = -1    inner radius of washer is the distance between y = 1 and y = -1    the area of one cross-section of a washer is    solid lies between x = 0 and x = 2. the volume is    if you need this expanded, then    the question doesn't say to evaluate, so we're done.