To find the average, add up all the numbers and then divide the sum by the number of numbers you added.
7+11+21=39
39/3=13
The average is 13.
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6+8+7= 21 21/3 = 7 The average is 7.
x/11 + 21 = 7 x/11 = -14 x = -154
x/11 + 21 = 7 x/11 = -14 x = -154
The average is 11.
11/21 To subtract two fractions, you need to make the denominators (the bottom numbers) equal. 6/7 = 18/21 1/3 = 7/21 18/21 - 7/21 = 11/21