The long distance bill is
Monthly fixed $8
Monthly variable $0.06 per minute
If the cost is c and minutes m, we can write cost as:
[tex]c=8+0.06m[/tex]Given, last month's cost, c, to be $13.64, we want to find the minutes.
We put 13.64 into 'c' of the formula found and find m.
Shown below:
[tex]\begin{gathered} 13.64=8+0.06m \\ 13.64-8=0.06m \\ 5.64=0.06m \\ m=\frac{5.64}{0.06} \\ m=94 \end{gathered}[/tex]Ansswe
