Answer:
a) m is the money you have left after buying DVDs
50 is the total amount of money you have before buying DVDs
d represents one dvd
-9 represents one dvd costing 9 dollars
b) The domain is [0,50] U [5,5]
The domain is discrete because there can be no decimal/fraction numbers for x because you can't buy parts of a dvd, only whole dvds.
c) graph the points [0,50] [1,41] [2,32] [3,23] [4,14] and [5,5]
Explanation:
The x values in the domain can only go up to 5, because you dont have enough money to buy more than 5.