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If x is the average (arithmetic mean) of m and 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

 Apr 15, 2021
 #1
avatar+113124 
+1

First write x, y, and z in terms of m

 

hint:     z=(3m+18)/2

 

then add x, y, and z together and divide by 3.    (because there are 3 of them)

 

Now you do it   laugh

 Apr 15, 2021

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