Please help need the answer now!!

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

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp