Plz I need help and a explanation plz because I need to do more of them and I don’t get how to do them

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.

Solve the system of equations. y= 2x y= x^2 - 15

How do you convert 1.27 to a percentage