Write the solution set using interval notation.
-When making a long distance call from a certain pay phone, the first three minutes of a call cost $2.10. After that, each additional minute or portion of a minute of that call costs $0.20. Use an inequality to find the
Maximum number of minutes one can call long distance for $2.50.
A) at most 1 minutes
B) at most 5 minutes
C) at most 13 minutes
D) at most 2 minutes

Question

Quizplus · Accepted Answer

The cost of the first three minutes is $2.10. With $2.50, you have $2.50 - $2.10 = $0.40 left for additional minutes. Each additional minute costs $0.20, so with $0.40, you can afford 2 more minutes. Therefore, the maximum number of minutes one can call is 3 (initial minutes) + 2 (additional minutes) = 5 minutes.

Write the Solution Set Using Interval Notation