Last year Nancy's annul salary was x dollars. This year she received a raise of y dollars

Question:

Last year Nancy's annul salary was x dollars. This year she received a raise of y dollars per year. She is paid semimonthly.
a. Express her semimonthly salary last year algebraically.
b. Express her semimonthly salary this year algebraically.
c. On a monthly basis, how much more does Nancy earn as a result of her raise?