Help not much time to finish

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.

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=