How can i explain that i am useing multiplication to solve the proportion

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.

Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2