Need help pls For today

Find the length of cu, the triangles are similar.

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.

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.