What are the possible numbers of minutes he has used his phone in a month?

Question

Problem Page

For his phone service, Greg pays a monthly fee of $11

, and he pays an additional $0.06

 per minute of use. The least he has been charged in a month is $84.26

.What are the possible numbers of minutes he has used his phone in a month?

Use 

m

 for the number of minutes, and solve your inequality for m

.

Answer 1

First, you should subtract Greg's monthly fee from the total bill. This would give you the following equation:

$84.26 - $11.00 = $73.26. Make sure you line up the numbers properly when you subtract, like so:

$84.26

$11.00.

$73.26 represents his charges for minutes used. To find out how many minutes he used, divide the total charge for minutes used by the amount Greg pays for minutes. If m = number of minutes used, your equation would like like this: m = $73.26/$0.06 . To make the equation easier to do, convert both amounts to cents. $73.26 = 7326 cents. $0.06 = 6 cents. Now you have m = 7326 / 6 = 1221 minutes.

To check this answer, multiply 1221 minutes x 6 cents. This gives 7326 cents, or $73.26, which matches the number we started with, so m = 1221 minutes. Hope you found this uesful!