Final answer:
A. The equation to represent the scenario is 500 + 10w. B. One year from today, my grandfather will have 1020 cards. C. We cannot determine the number of weeks ago my grandfather started if the pattern has been happening for a long time.
Step-by-step explanation:
A. Let's define the number of weeks as w. The number of cards collected each week is 10. We can represent the total number of cards collected by my grandfather as 500 + 10w.
B. To find the number of cards my grandfather will have one year from today (52 Saturdays from now), we substitute w = 52 into the equation 500 + 10w. This gives us 500 + 10(52) = 500 + 520 = 1020 cards.
C. If this pattern has been happening for a long time, we can find the number of weeks ago my grandfather started by solving the equation 500 + 10w = 0 for w. In this case, w would be negative, indicating that it happened in the past.