The answer is B.55.8. Hope this helps!!
Answer:
x = -2
Step-by-step explanation:
If you were to make both x's equivalent, you'd have to multiply the first equation by 2 to get rid of the coefficient, 1/2. However, you'd have to multiply 2 onto -8 as well, therefore the equation would turn into x - 16 = 18. That is not equivalent to x - 8 = 18.
Mean = Sum / number
Mean = (8 + 6 +4) / 3
= 18 / 3
= 6
Mean = 6