Please help, all i need is the answer i think this is 7th grade

Option 1: $30 an hour plus a nonrefundable deposit of $50 option 2: $20 an hour plus a nonrefundable deposit of $75 kyle is renting a jetski for the day. if he can rent the jetski in one hour increments, what is the minimum number of hours must he rent the jetski for option 2 to be a better deal then option 1?

Which term best describes the association between variables a and b

Solve x+3y=6 and 4x-6y=6 by elimination . show work !