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Question

In 2012, the postage for parcels sent by first-class mail was raised to $1.95 for any parcel weighing less than 4 oz or fraction thereof and 17c for each additional ounce or fraction thereof. Any parcel not exceeding 13 oz may be sent by first-class mail. Letting x denote the weight of a parcel in ounces and f(x) the postage in dollars, complete the following description of the "postage function" f:

$f(x)=\left\{\begin{array}{ll} \$ 1.95 & \text { if } 0<x<4 \\ \$ 2.12 & \text { if } 4 \leq x<5 \\ \vdots & \\ ? & \text { if } x=13 \end{array}\right.$

a. What is the domain of f? b. Sketch the graph of f.

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