This is a question in our econometrics class, and we're unsure of how to deal with the additional z2 and z3 in part B and part C.

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    $\begingroup$ Hi, Welcome to Economics SE! we have a policy regarding homework questions where users must demonstrate effort using text, markdown syntax and/or images space provided in the text of his question submission for the site. Using only images as proof of work is insufficient. for more details see:economics.meta.stackexchange.com/questions/1465/… $\endgroup$ – 1muflon1 Oct 4 at 20:31