The cost of an ad in a local paper is given by the piecewise function

a. Find the cost of a three-line ad.
b. Find the difference in cost between a one-line ad and a four-line ad.
c. Find the cost of a seven-line ad.
d. Graph this function on your graphing calculator.
e. Find the coordinates of the cusp from the graph in part d.

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ca)38 when x s 4 138 + 6.25(x-4) when > 4