please answer both

A) Lanny and Shirley are divorced in 2018 and do not live together. Shirley has custody of their child, Art, and Lanny pays Shirley $22,000 per year. All property was divided equally. How much should Shirley include in income if Lannys payments drop to $16,000 once Art reaches the age of 18?

B) Grady received $9,200 of Social Security benefits this year. Grady also reported salary and interest income this year. Grady files married joint and reports salary of $75,000 and interest income of $500. What amount of the benefits must Grady include in his gross income?