Problema Solution
your monthly cell phone bill $65 per month plus and additional charge of $0.15 per minute. If you go over the 1000 minutes included in the plan. If your cell phone bill was $200 last month, how many extra minutes did you use?
Answer provided by our tutors
200 = 65 + 0.15(x-1000)
200 - 65 = 0.15(x-1000)
135/0.15 = x - 1000
900 = x - 1000
x = 1900
so extra minute used = 900