Last question please help.

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Put the equation in slope intercept form by solving for y

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.