First-Class Postage The postage charged for first-class mail is a function of its weight. The U.S. Postal Service uses the following table to describe the rates for 2011.
Weight Increment x (oz) | First-Class Postage P(x) |
First ounce or fraction of an ounce | 44c |
Each additional ounce or fraction | 20c |
a. Convert this table to a piecewise-defined function that represents first-class postage for letters weighing up to 4 ounces, using x as the weight in ounces and P as the postage in cents.
b. Find P(1.2) and explain what it means.
c. Give the domain of P as it is defined above.
d. Find P(2) and P(2.01).
e. Find the postage for a 2-ounce letter and for a 2.01-ounce letter.
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