I need help. I’m confused and would like some help. Thanks!!

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?