Answers
Qs 9 . No of text Messages = x , Cost of text messages = c(x)
c(x) = $19+(x)*.1
Qs 10 . The first plan would be better if it is usually 500 text messages per month compared to flat $50 per month.
Total Cost = 250 messages + (Additional Message)*$0.1
= $19+ $(250*0.1) = $44. It is cheaper than flat $50 plan.
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