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QuestionRaina's phone card has C=45.00−0.06xC=45.00-0.06x. How much credit is left after 15 minutes of calls?

Studdy Solution

STEP 1

Assumptions1. The initial credit on the phone card is 45.00.Thecostperminuteofcallis45.00. The cost per minute of call is 0.063. Raina used the card for15 minutes of calls

STEP 2

We need to calculate the cost of15 minutes of calls. We can do this by multiplying the number of minutes by the cost per minute.
Cost of calls=Minutes of callstimesCost per minuteCost\, of\, calls = Minutes\, of\, calls \\times Cost\, per\, minute

STEP 3

Now, plug in the given values for the minutes of calls and cost per minute to calculate the cost of calls.
Cost of calls=15times0.06Cost\, of\, calls =15 \\times0.06

STEP 4

Calculate the cost of15 minutes of calls.
Cost of calls=15times0.06=$0.9Cost\, of\, calls =15 \\times0.06 = \$0.9

STEP 5

Now that we have the cost of calls, we can find the remaining credit on the card. This can be done by subtracting the cost of calls from the initial credit.
Remaining credit=Initial credit−Cost of callsRemaining\, credit = Initial\, credit - Cost\, of\, calls

STEP 6

Plug in the values for the initial credit and the cost of calls to calculate the remaining credit.
Remaining credit=$45.00−$0.9Remaining\, credit = \$45.00 - \$0.9

STEP 7

Calculate the remaining credit on the card.
Remaining credit=$45.00−$0.9=$44.1Remaining\, credit = \$45.00 - \$0.9 = \$44.1After Raina uses the card for15 minutes of calls, the remaining credit on the card is $44.1.

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