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Suppose that the density of cars (in cars per mile) down a
20-mile stretch of the Pennsylvania Turnpike
is approximated by
at a distance miles from the Breezewood toll plaza.
Sketch a graph of this function for .

(a)
Complete the Riemann sum that approximates the total number of cars
on this 20-mile stretch (use instead of ):
Number =

(b)
Find the total number of cars on the 20-mile stretch.
Number =