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itscheesycheedar
16.07.2019 •
Mathematics
Lashonda purchased a prepaid phone for $20 . long distance calls cost 21 cents a minute using this card .lashonda used her card only once to make a long distance call . if the remaining credit on her card is $9.92 , how many minutes did her call last ?
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Ответ:
We have then:
x: number of minutes
y: total cost of the call.
We now write the equation that models the problem:
Since the remaining credit is 9.92 $, then we evaluate the value of y = 9.92 in the equation:
From here, we clear the value of x:
The last call was 48 minutes.
Ответ:
Step-by-step explanation: