Problema Solution
You wonder if you can save money by using your cell phone for all long distance calls. Long distance calls cost $.5 per minute on your cell phone. The basic plan for your cell phone is $29.99 each month. The cost of regular phone service with unlimited long distance is $39.99. Define a variable and write an inequality that will help you find the number of long-distance call minutes you may make and still save money
Answer provided by our tutors
Let
x = number of long-distance call minutes in a month
If you choose the basic plan the monthly cost is
f(x) = 0.5*x + 29.99
Since we want to save money using the cell phone we have the following inequality
f(x) < 39.99
0.5*x + 29.99 < 39.99
x < 20
If you want to save money by using your cell phone you are allowed to talk not more then 20 min.