A cell phone plan costs $200 to start. Then there is a $50 charge each month. Is there a proportional relationship between time and the cost of the cell phone plan? Explain how you know.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236