Martina purchased a prepaid phone card for $20 . Long distance calls cost 14 cents a minute using this card. Martina used her card only once to make a long distance call. If the remaining credit on her card is$17.90 , how many minutes did her call last?

15

Step-by-step explanation:

The first thing is to calculate what she used for the card that would be:

20 - 17.9 = 2.1

Which means that she spent a total of $ 2.1.

They tell us that the value of the minute at long distance is 0.14 dollars, to know the time in minutes that it took, speaking, we must divide the value spent by the value of each minute, like this:

2.1 / 0.14 = 15

Which means it took 15 minutes for the only call he made.

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step-by-step explanation:

c. 6tan80

step-by-step explanation: