Write the prime factorization of 63 and 90 to reduce 63/90

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.

Which of the following vectors are orthogonal to (2,1)? check all that apply

A-2+3=-2 i really need with this i can not figure i out for nothing so can someone a friend