Help Please I am not sure how to do this?

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?

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14