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October 22, 2014

October 22, 2014

Posted by **Priscilla** on Sunday, June 8, 2014 at 12:30am.

- Math -
**Reiny**, Sunday, June 8, 2014 at 8:26amThe equation for your cost:

cost = .1(m-500) + 25 , where m is in minutes

so :

.1(m-500) + 25 > 30

For the second part, m = 525

cost = .1(525-500) + 25

= $27.50

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