Sara paid $20 to join Planet Fitness. She then pays a monthly fee. Her total cost for 24 months was $260. What was the monthly fee that she paid?

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *