for Christmas, Maryland purchased a subscription to Xbox live. it costs $5 per month plus a $15 sign-up fee. if she received a bill for $120, for how many months did she purchase subscription for her children

Make an equation: 15 + 5m = 120, where 15 is the sign up fee, 5m represents 5 dollars per month, and 120 represents the total amount spent.

Solve for m, months, to find how many months Maryland purchased subscription for her children.

Subtract 15 from both sides.

5m = 105

Divide both sides by 5.

m = 21

Maryland purchased subscription for 21 months.

Total money spent for subscription = 120 - 15 = 105

Monthly subscription = 15

Therefore, the number of months = 105/15 = 7 months