Answer:
[tex]c(w)=\begin{cases}5,&\text{for }w\le15\\7,&\text{for }15<w\le45\\9,&\text{for }w>45\end{cases}[/tex]
Step-by-step explanation:
The charge in dollars (c) for walking a dog of weight w pounds can be described by the function shown above. The function has three parts, one for each weight class. Here, the function value is constant within the weight class.