finding hours

Question

For her phone service, Maria pays a monthly fee of $20 , and she pays an additional $0.07 per minute of use. The least she has been charged in a month is $104.84 . What are the possible numbers of minutes she has used her phone in a month? Use m for the number of minutes, and solve your inequality for m .

Answer 1

Cost = 0.07*Minutes + Monthly fee  

 

Cost >= 104.84  ==> 

 

0.07*m + 20 >= 104.84

0.07*m >= 84.84

m >= 84.84/0.07 

m >= 1212 minutes