Find the missing term

Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

Which best describes the strength of the correlation, and what is true about the causation between the variables? it is a weak negative correlation, and it is not likely causal. it is a weak negative correlation, and it is likely causal. it is a strong negative correlation, and it is not likely causal. it is a strong negative correlation, and it is likely causal.

Look at attachment. has all info needed. need