9m + 9m + 3m + 3m = 24m
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6m + 20 = 9m - 4 24 = 3m m = 8
This question as written can be taken two ways: 9m + 6n - 3m + 7n = 6m + 13n, or (9m + 6n) - (3m + 7n) = 9m + 6n - 3m - 7n = 6m - n
z = (x-mu)/sigma So x = sigma*z + mu = 3m*(-3) + 25 = -9m + 25
3m + 15 = 45 3m = 30 m = 10
3m + 11n = 3