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{{ printedBook.courseTrack.name }} {{ printedBook.name }} Let $y=f(x)$ and $x$ be the cost and weight, respectively. We are told that first-class postage was $$0.42$ for up to $one ounce.$ Remember that up to

means less than or equal to.

In this case, the rule and domain for the first step can be written as shown below.
$f(x)=0.42,for0<x≤1 $
Since the cost increases by $$0.17$ for each additional ounce, we can write the rule of the next steps by adding $0.17$ to the first step until the domain reaches to $3.5.$
$f(x)=⎩⎪⎪⎪⎪⎨⎪⎪⎪⎪⎧ 0.42,for0<x≤10.59,for1<x≤20.76,for2<x≤30.93,for3<x≤3.5 $
The function we wrote pairs every number in each interval with a single value. Therefore, it is a step function. Each piece of its graph will be a horizontal line that is missing its left endpoint. We will show the left endpoints using open points and the right endpoints using closed points. Let's graph it!