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4 - (-5) = 4 + 5 = 9.
3, 4, 5, 6, 7, 8, 9, 10, 11
5. 3+6+9+2 = 20 20 / 4 = 5. To calculate the average of a series of numbers you have to add them together and divide them by the amount of numbers given.
5+7+9+12+12 = 45 and 45/5 = 9 which is the mean average
5 + 4*(3-2) = 9(5 - 4)*3^2 = 9 - 5 + 4 * 3 + 2 = 9