3. Find the mean of each group of numbers:
27, 27, 27, 27, 27
11, 17, 13, 16, 18
52, 61, 59, 63, 57
36, 48, 52, 37, 50, 46, 38, 51
79, 89, 87, 78, 88, 89
1.1, 1.3, 1.2, .4
26.1, 23.4, 28.6, 20.4, 18.0, 21.1
63.02, 48.12, 52.35, 60.03-
3, 2 ¾, 2 ¼

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

What expression is equivalent to 42x-56y

The first few steps in solving the quadratic equation 9x2 + 49x = 22 ? 5x by completing the square are shown. 9x2 + 49x = 22 ? 5x 9x2 + 54x = 22 9(x2 + 6x) = 22 which is the best step to do next to solve the equation by completing the square? 9(x2 + 6x + 3) = 25 9(x2 + 6x + 3) = 49 9(x2 + 6x + 9) = 31 9(x2 + 6x + 9) = 103