Independent variables are things that can stand alone. Which set of these variables does not rely on each other? For example the income and savings. I want 1,000,000 in my savings account, however my income is not nearly that high since I only make 19,000. Look at the other pairs and see if there is a correlation between them.
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I would maybe be able to help if it wasn't so blurry
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the answer to this question is 121 but there is a problem with that question because its common difference is not the same