Plz help

No like for real I don’t understand:(

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.

This is so harddd! solve. 1 + 1 = solve 4 + 4 = solve 3 x 3

How many days was the temperature above 90 degrees?