In some future activities, you will need to work with negative numbers. Negative numbers arise naturally when one computes the difference between two quantities. If the difference is negative, not only do you know the difference between the two quantities, but you also automatically know which value was the larger of the two! The following table was created to compare two cell phone plans, Plan A and Plan B. The monthly bill for each plan was computed based on the number of minutes used that month. While the actual monthly bills are not given, their differences are given in the last column. Comparing Plan A to Plan B Minutes Plan A Bill Plan B Bill (Plan B - Plan A) (in dollars) 50 * * -7.50 100 * * -5.00 150 * * -2.50 200 * * 0 250 * * 2.50 300 * * 5.00 350 * * 7.50 400 * * 10.00 When are the two plans equal? Write your answer as a complete sentence