Question

for his phone service carlos pays a monthly fee of $19 and he pays an additional $0.07 per minute of use the lease has been charging a month is $97.75 what are the possible numbers of minutes he has used his phone in a month?

Answer 1

first you should try to find the closest multiple of 19 which you should multiply 19 by 5 and get 95. then subtract 97.75-95 which equals 2.75.  2.75 then needs to be divided by the cost per extra minute 0.07 so 2.75 divided by .07 which gets you 39. 39 minutes