Marcos purchases a top-up card for his pre-paid cell phone. His remaining balance, B, can be modeled by the equation B=50−0.05nB=50-0.05n, where n is the number of minutes he's talked since purchasing the card.   a) How much money was on the card when he purchased it? $     . Which intercept is this? B or N - intercept? b) How many minutes will he have talked when he runs out of money? minutes. Which intercept is this?     B or N- intercept? c) What is the slope of this equation?  What are the units on the slope? a) Minutes per dollar b) Minutes c) Dollar per minute  d) Dollars

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