An auditorium has 20 rows of seats. there are 20 seats in the first row, 21 seats in the second row, 22 seats in the third row,
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Answer:
check the photo below for the detailEd Answer
Step-by-step explanation:
Not much can be done without knowing what 
is, but at the least we can set up the integral.
First parameterize the pieces of the contour:
where
and 
. You have
and so the work is given by the integral
First parameterize the pieces of the contour:
where
and so the work is given by the integral