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Jane's cell phone plan is $40 per month plus $.15 per minute for each minute over 200 minutes of call time. If Jane's cell phone bill is $58.00, for how many extracalling minutes was she billed.
4 years ago

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oobleck
40 + 0.15(m-200) = 58
solve for m.
call time: 200+m minutes
4 years ago

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