x is the average (arithmetic mean) of mand 9, y is the average of 2m and 15, and z is the average of 3m and 18, what is the average of x, y, and z in terms of m?
A) m+6
B) m+7
C) 2m+14
D) 3m+21
plz answer mat dena
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Answer: D)3m+21
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