-10 2/5 + (-7 1/3)

Answer with a mixed number

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?

Ineed i been stuck on this question since yesterday

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,