A town has two cell phone providers. The provider DontTalkMuch charges $80 per month, plus 1 dollar per hour. The provider TalkLots charges $20 per month, plus 4 dollars per hour. How much do you have to use your phone in a month in order for DontTalkMuch's deal to be better for you?

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )