Guys actually help me with this please.

Measures of the angle of r, 31 s (x+4) t (3x+9)

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.

Five infinity stones cost $16.80. what is the price per infinity stone ?