Question: 1. List the elements of {n ∈ N | n2 = 4}.
2. An excerpt from a 2010 Blue Cross Blue Shield survey: "Do not include care you got when you stayed overnight in a hospital. Do not include the times you went for dental care visits . . . In the last 12 months, not counting the times you needed care right away, how often did you get an appointment for your health care at a doctor's office or clinic as soon as you thought you needed?" What type of needed care is the question asking about? What is excluded? Can you find a simpler way to word the question clearly?