Question

I need help with this

Answer 1

`\text{ 78 miles per hour}`

Explanation:

Given the linear function for the traffic fines:

`f(s)=14(s-60)+40`

If a fine comes to $292, substitute f(s)=292 and solve for "s" to find the speed of the person:

`\begin{gathered} 292=14(s-60)+40 \\ 292=14s-840+40 \\ 14s=292+840-40 \\ 14s=1092 \\ s=(1092)/(14) \\ s=78\text{ miles per hour} \end{gathered}`