The number is 17.
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The sum of -18 and 39 is 21.
39.
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.
23 * 16 = 368
9, 11, and 139 + 2(11) + 3(13) = 9 + 22 + 39 = 70