This question is a lot less complicated than it sounds: cost = c amount of tickets = s
Since we know that each ticket costs 7$, we multiply the amount of tickets by 7. c = 7s
The 7 is an independent variable. It will always be multiplied by s, no matter what s is. The c is a dependent variable. Different numbers for s change what c is.
Answer: 35 more times How: (if she gets 60 points for each grocery store visit then first do 2580-480=2100. she still needs 2100 points so then 2100/60 = 35 grocery visits!)