Jessica has a bubble tea card worth $200. After she bought the first bubble tea, the card’s value is $196.5. After she bought the second bubble tea, its value is $193. After she bought the third bubble tea, the card is worth $189.5. Assuming the pattern continues and that all bubble teas cost the same , a) Write an equation to define A(n), the amount of money on the card after n bubble teas purchased.
b)Jessica buys a bubble tea every Friday after school. How many weeks in a row can she afford to buy a bubble tea, using her card only?
C) explain how you arrived at your answer in part b

Solve with a graph please