Line RS is perpendicular to Line ST. FIND THE VALUE OF X.

Which fraction below is equivalent to 10/12?

Having a hard time understanding this question (see attachment).

Ebuka's monthly rent is $750. if ebuka pays the rent late, his landlord charges 4% interest per week that the payment is late. write a function that gives the total cost r(t), in dollars, of ebuka's rent if he pays it t weeks late.