Pick b I think hahahahaha
Answer:
<em>B.) M + 7</em>
Explanation:
Since the average (arithmetic mean) of two numbers is equal to the sum of the two numbers divided by 2, the equations X = m+9/
2
, Y = 2m+15/2
, Z = 3m+18
/2 are true. The average of x, y, and z is given by x+y+z
/3
. Substituting the expressions in m for each variable (x, y, z) gives:
[
m+9
/2
+
2m+15/
2
+
3m+18/2
] / 3
This fraction can be simplified to <em>m+7.</em>
