Question

for her phone service, Ann pays a monthly fee of $13, and she pays a ln additional $0.06 per minute of use. the least she has been charged in a month is $77.68what are the possible number of minutes she has used her phone in a month?use m for the number of minutes and solve your inequality for m.

Answer 1

First we have to write a general equation for the cost she has been charge so it will be:

`y=13+0.06\cdot m`

then if she paid 77.68 then we can teplace that and solve for m so:

`\begin{gathered} 77.68=13+0.06\cdot m \\ 77.68-13=0.06\cdot m \\ (64.68)/(0.06)=m \\ 1078=m \end{gathered}`

so she use exactly 1078 minutes