Please help me I'm confused .-. write a compound inequality for each situation

14. Children and senior citizens receive a discount on tickets at the movie theater. To receive a discount, a person must be under 10 years old, or 65 years or older.

15. The scores on the last test ranged from 65% to 100%.

16. Mercury is one of only 2 elements that are liquid at room temperature. Mercury is nonliquid for temperatures less than -38°F or greater than 673.8°F. Write a compound inequality for the temperatures at which mercury in nonliquid.