1. In a zoo, there were 36 exhibits, but k exhibits were closed. Write the expression for the number of exhibits that were open.

2. The zoo is open for 9 hours on weekdays. On weekends, the zoo is open for r more hours. Write the expression for the number of hours the zoo opens on weekends.

3. In the lion exhibit in the zoo, there are n lions. 3/5 of the lions are female. Write the expression for the number of female lions.