C, because the opposite would be + 2 and none of the ions have that charge
Answer:

Step-by-step explanation:
Circumference is given by this formula below. What gives us the radius.

The diameter of the circle is calculated by dividing the Circumference, 11304 in this case by 

Answer:
x=8
Step-by-step explanation:
We want t(x)=3x;t(x)=24
Let 3x = 24
Divide each side by 3
3x/3 =24/3
x =8
Ignore the more complicated fraction. All they care about is finding the LCD of y and (y-3)/3
Think of the first y as y/1. We can write this as 3y/3 (multiply top and bottom by 3)
So y + (y-3)/3 turns into 3y/3 + (y-3)/3. At this point we can combine the fractions since the denominators are both 3.
Final Answer: Choice D) 3