How do very long radio waves reach stations beyond the curvature of the earth? a. they pass through the middle of the earth c. they are relayed by multiple stations b. they cannot reach stations around the curvature of the earth d. they bounce off a charged layer of the atmosphere

For which of the following counts would a binomial probability model not be reasonable? a)the number of people in a classroom born in januaryb) the number of people in a classroom with red hair c) the number of people admitted to a hospital in a day with a particular disease d) the number of heart beats in a one-minute perio.

True or false? a circle could be circumscribed about the quadrilateral below.

Which of the following disjunctions is true? 4 + 4 = 16 or 6 - 5 = 11 4 · 3 = 7 or 3 - 2 = 5 8 - 5 = 13 or 7 · 2 = 12 7 - 4 = 11 or 6 + 3 = 9