Answer:
To find the number of cards, you must use the equation c = 300 + 17d. Collecting your known information in an organized form will be realllly helpful now and in the future. C represents the number of cards, while D represents the number of days!
Explanation:
Starting with the original amount, which is 300---->
Here is the answer:
15 - 1 + 3 = 17 extra cards per day