For his phone service, tony pays a monthly fee of $27, and he pays an additional $0.04 per minute of use. the least he has been charged in a month is $70.44. 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.

For this case we have as a fact that Tony pays monthly $ 27 for telephone service, in addition to $ 0.04 per minute of additional use.

If "M" represents the number of minutes used by Tony in a month we have:

If the minimum that has been charged in a month is $ 70.44 then:

Clearing "M" we have:

We subtract 27 on both sides of the inequality:

We divide by 0.04 on both sides of the inequality:

Tony uses at least 1086 minutes per month.

Tony uses at least 1086 minutes per month.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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