Plz help meh this is the last question for my hw

Kevin has just finished paying off his loan. he was assessed a service charge of $422. he paid off the principal and the interest by making weekly payments of $36.13 for four years. if the principal was $7,150, how much did kevin pay in finance charges, to the nearest dollar? a. $498 b. $365 c. $422 d. $787

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

In the diagram of circle o, what is the measure of zabc?