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I got the same for the multiple choice. And I did the same for the voltage drop, but wasn't entirely sure about it... makes more sense now though.

Hope this isn't too late. Not sure on the first few, last one I can though. I presume the answer is meant to be for all values of k, not x. For which values of k will the equation: 2x^2 + kx – 43 = 0 have real and distinct roots? Discriminant > 0 for real and distinct roots discriminant =...