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Each day you use your pay-as-you-go cell phone you pay $.25 per minute for the first 10 minutes and $.10 per minute for any time over 10 minutes. write an equation that gives the daily cost c (in dollars) as a function of the time t (in minutes) when usage exceeds 10 minutes. which costs more, using the phone for 10 minutes today and 15 minutes tomorrow, or using the phone for 25 minutes today?
Sagot :
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