Charlie commutes from Gardentown to Workton for work. He makes the journey every day
Monday to Friday, and also has to go to work every third Saturday. He never goes to Workton on
Sundays, and nor does he ever go apart from going to work.
If Charlie buys the tickets that keep his travel costs as low as possible, how much will this cost
him for a three-week period?

The answer is correct

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.   

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