If my answer is 3 what number card am i thinking of if you add 8 to the number then subtract 7

Need on this one asap im almost done with this subject

Find the values of y: 3y^3(y^2+ 2/3y)=0

Madeline takes her family on a boat ride. going through york canal, she drives 6 miles in 10 minutes. later on as she crosses stover lake, she drives 30 minutes at the same average speed. which statement about the distances is true?