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14 January, 12:46

What is the average (arithmetic mean) of (5x + 16), (8x + 4), (-4x - 2) ?

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  1. 14 January, 15:19
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    We have (5x+16 + 8x + 4 - 4x - 2) / 3 = (9x + 18) / 3 = 9 (x + 2) / 3 = 3 (x + 2) = 3x + 6;
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