subquery questions

1) Return the countries given in the region (just the country)

2) Return the countries given in the region except for those in the Americas ( just the country)

3) Return the countries in the region that starts with the letter 'A' ( again just the country name)

4) Return the names ( last and first names) of the managers who have more than 7 employees working under them. hints: only need the employee databse and need to use the COUNT function.