The cell phone plan from Company C costs $10 per month, plus $15 per gigabyte for data used. The plan from Company D costs $70 per month, with unlimited data.
The Rule `C` gives the monthly cost, in dollars, of using `g\ ` gigabytes of data on Company C’s plan. The rule `D` gives the monthly cost, in dollars, of using `g\ `gigabytes of data on Company D’s plan.
Which is less, C(4) or D(4)? What does this mean for the two phone plans?
