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How do I use resistors to lower voltage by only a few volts. Talking 600 volts lowered down to 597 to power a 597V motor.? Given a sample size of 36, how large does the population standard deviation have to be in order for the standard error to be 1? Is 1g NaCl tablet that can be bought in drugstores the same as 1g NaCl powder? Describe the physical properties of copper sulfate pentahydrate & anhydrous copper sulfate. Describe what happens and explain why it happens? Can someone help with the algebra question?

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