Posted by Priscilla on Sunday, June 8, 2014 at 12:30am.
You have a wireless phone plan that costs $25 per month. You must also pay $.10 per minute for each minute over 500 min. you phone bill was more than $30 last month. Write an inequality to represent the number of minutes m you spent on the phone last month. Suppose you use 525 min next month. How much will your bill be?

Math  Reiny, Sunday, June 8, 2014 at 8:26am
The equation for your cost:
cost = .1(m500) + 25 , where m is in minutes
so :
.1(m500) + 25 > 30
For the second part, m = 525
cost = .1(525500) + 25
= $27.50

Math  Anonymous, Thursday, October 22, 2015 at 8:11pm
Thanks so much for this equation it really helped me!!!!!!
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