Chapter 8.6, Problem 60CCR

To determine

Find the number of minutes you can talk that month.

Answer to Problem 60CCR

The number of minutes you can talk that month is 180 minutes.

Explanation of Solution

Given:

A cell phone plan charges $7 per month and $0.10 per minute. If the monthly cost is $25, find the number of minutes you can talk this month.

Concept Used:

Translate the sentence into an equation.

A cell phone plan charges $7 per month and $0.10 per minute. If the monthly cost is $25, find the number of minutes you can talk this month.

Let the number of minutes you can talk x minutes.

Cost for x minutes talking = $\text{0}\text{.10}x$

A cell phone plan charges $7 per month and $0.10 per minute and the monthly cost is $25.

The required equation: $7+0.10x=25$

Calculation:

Let the number of minutes you can talk x minutes.

The required equation: $7+0.10x=25$

Now solve for x:

  $\begin{array}{l}7+0.10x=25\\ 7-7+0.10x=25-7\\ 0.10x=18\\ \frac{0.10x}{0.10}=\frac{18}{0.10}\\ x=180\end{array}$ The number of minutes you can talk that month is 180 minutes.

Thus, the number of minutes you can talk that month is 180 minutes.