Please answer this correctly

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x

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.

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?