Roots (x-intercepts) are found with which part of a rational equation?

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.

For how answer my question this will be the last question can you answer in math subject

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?