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Mathematics 12 Online
OpenStudy (anonymous):

In 1990 the U.S. postal service charged $1.17 postage for first class-mail retail flats (such as an 8.5" by 11" evelope) weighing up to 1 ounce, plus $0.17 for each additional ounce up to 13 ounces. First-class rates do not apply to flats weighing more than 13 ounces. Develope a model that relates C, the first-class postage charges, for a flat weighing x ounces.

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