Question

the Arithmetic mean of x, x + 3 X + 6 X + 9 and X + 12​

Answer 1

Answer: Hope it is right

Step-by-step explanation:

Answer 2

Answer:

4x+7

Step-by-step explanation:

mean is average.

arithmetic mean

= sum of all numbers/total numbers

=(x) +(x+3x+6x+9) +(x+12) /3

= x+x+3x+6x+9+x+12/3

= 12x+21/3

= 3(4x+7)/3

= 4x+7