For tax year 2019, determine the number of dependents in each of the following independent situations. 

a. Leo and Amanda (ages 48 and 46, respectively) are husband and wife and furnish more than 50% of the support of their two children, Elton (age 18) and Trista (age 24). During the year, Elton earns $4,500 providing transportation for elderly persons with disabilities, and Trista receives a $5,000 scholarship that is used entirely for tuition at the law school she attends. 

b. Audry (age 45) was divorced this year. She maintains a household in which she, her ex-husband (Clint), and his mother (Olive) live and furnishes more than 50% of their support. Olive is age 91 and blind.