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Kristi’s cell phone company charges her a fixed monthly fee of $6.95 plus $0.07 per minute of service usage. If her bill last month was $18.15, how many minutes of cell service did Kristi use?
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Kristi’s cell phone company charges her a fixed monthly fee of $6.95 plus $0.07 per minute of service usage. If her bill last month was $18.15, how many minutes of cell service did Kristi use?

User Gokul Kathirvel
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160 minutes. The formula for Kristi's bill is (6.95 plus 0.07 per minute for a total of 18.15) 6.95 + 0.07m = 18.15 Subtract 6.95 from both sides 0.07m = 11.20 Divide both sides by 0.07 m = 11.20 / 0.07 = 160 So Kristi used 160 minutes.
User ROBERT RICHARDSON
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