Postal Regulations In 2014, the postage for parcels sent by first-class mail was raised to \2.32 for any parcel weighing less than 3 oz or fraction thereof and 18¢ 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}\ 2.32 & \text { if0 }﹤ x﹤4 \\\ 2.50 & \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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