10. what is the mean of the data? 186, 181, 176, 149, 184, 190, 158, 139, 175, 111

164.9

The mean is the average of all the numbers. To get this, you add all of the numbers together and divide the result by the amount of numbers.
Start by adding all of the numbers together to get 1,649.
Now, divide that by 10, since there are 10 numbers. This gives you a mean of 164.9.

2x + y 3 x - 2y -1

2(3 x - 2y) = -6x + 4y

2x + y + -6x + 4y + -1 = -4x + 5y -1