It is:12a
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We can certainly simplify that term. 6x - 3x = 3x. And -4y + y = -3y. So the simplified expression is 3x-3y. You could also call this 3(x-y). That's as far as we can go, since we have no way to evaluate x or y without further information.
The mean value of 100, 70, 70, and 20 is 65
2 cups
12, plus 2 jokers. There are 54 cards in all, 52 in the regular deck plus the 2 jokers.
Mean plus or minus 1.95 SEM. Mean minus 1,95 SEM to Man plus 1,95 SEM.