- Polar form of polar form of Z= (1+2i)/(1-(1-i))?

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Is 1g NaCl tablet that can be bought in drugstores the same as 1g NaCl powder? 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? If He(g) has an average KE of 8550 J/mol under certain conditions, what is the rms speed of O2(g) molecules under the same conditions? Express the confidence interval 0.62