What is the center of the circle x2 + y2 - 13x – 22 =0

Cora bought a package of erasers. there are 4 pink erasers and 12 blue erasers. what is the ratio of pink erasers to blue erasers?

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers