If the average (arithmetic mean) of x^2, 2x^2, and 3x^2 is 200, what is the value of x?
Select:
A) 10
B) 12
C) 15
D) 20
E) 25
10M of x^2, 2x^2 and 3x^2 = x^2 + 2x^2 + 3x^2 / 3 = 6x^2/3   Given that 2x^2 = 200   x^2 = 100   x = 10   10nswer is 10
<result>A</result>
If the average (arithmetic mean) of x^2, 2x^2, and 3x^2 is 200, what is the value of x?