Pls whats the answer

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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.

Can you me find the missing length. i attached an image.

Combine like terms to make a simpler expression 3z+z