1. The gross income threshold for a 60-year-old blind man who has no gross income, but is claimed as a dependent by his son is
2. The gross income threshold for a 36-year-old unmarried taxpayer who claims her two children as dependents and files as head of household is
3. A husband and wife file a joint return. They fully support their daughter (age 20) who had a gross income of $7,000. The daughter is a full-time student at Penn College. The total number of dependents that can be claimed on their joint return is
4. A couple, ages 50 and 52, files a joint return for 2018. The couple claims their son as a dependent. The wife is legally blind. For purposes of the requirement to file a tax return, the gross income threshold for the couple is
5. The maximum retirement savings contributions credit for an unmarried taxpayer who makes a $5,000 contribution to his IRA is