What would be an inequality for all real numbers x that are less than 3 or greater than 7

How can you find the mean absolute deviation (mad) for this set of data?

Which polynomial equation of least degree has -2, -2, 3, and 3 as four of its roots? (x + 2)(x - 3) = 0 (x - 2)-2(x + 3)3 = 0 (x-2 + 2)(x2- 3) = 0 (x + 2)2(x - 3)2 = 0

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?