In 2006, the first-class mail rate in the United States was 39 cents for the first ounce and 24 cents for each additional ounce or fraction thereof (up to 13 ounces).
a. Find a piecewise linear function P(x) that gives the first-class mail rate for letters not weighing more than 5 ounces.
b. Sketch the graph of P(x).
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