Question

Jenny pays a monthly fee of 24$, and she pays an additional $0.07 per minute of use. the least she has been charged in a month is 112.55$

Answer 1

First we can write an equation for the total cost she is being charged so:

$y=24+0.07t$

Where y is the total charge and t are the number of minutes, now we can replace y=112.55 to find how many minutes she spend so:

$\begin{gathered} 112.55=24+0.07t \\ 0.07t=112.55-24 \\ t=\frac{88.55}{0.07} \\ t=1265 \end{gathered}$