Mike has 21 books and 44 magazines in his library. He bought several books at a yard sale over the weekend. He now has 77 books in his library. How many books did he buy at the yard sale ?

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

Graph y = -|x| + 2. click on the graph until the correct one appears.

Sole the equation 6n + 9 = -3n - 21 - 6 for n