Problema Solution
You pay a certain long distance rate that depends on your number of minutes talked. If you talk from 0 to 700 minutes, you pay 20 cents a minute. If you talk 701 to 1500 minutes, you pay 12 cents a minute. If you talk anything over 1500 minutes, you pay 8 cents a minute.
a. Is the number of minutes you talk a function of your long distance rate?
b. Is your long distance rate a function of the number of minutes you talk?
Answer provided by our tutors
a No, because the number of minutes you talk is the independent variable. Also, you cannot calculate the number of minutes talked just by knowing the long distance rate that was paid.
b. yes. Let number of minutes you talk be n and long distance rate be r.
For n≤700, r=20
For 701≤n≤1500, r=12
For 1500