Ikeep getting this wrong can y’all me

On the april 3 billing date, michaelle chappell had a balance due of $ 1495.39 on her credit card. from april 3 through may 2, michaelle charged an additional $ 305.34 and made a payment of $ 800.a) find the finance charge on may 3, using the previous balance method. assume that the interest rate is 1.8 % per month. b) find the new balance on may 3.

Answer these questions showing your work plz

If f(x)= 3x+6 which of the following is the inverse of f(x)