- I think it is a simple statistics problem: (sum x)^2/T^2 = sum(x^2)/T how can i prove this ?

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Once a star leaves the main sequence, what provides the energy to power its luminosity? Why is migrating necessary? What is this as an equation the product of v and 346 is equal to a plus 85? Give and explain the trend in polarity of the covalent bonds in the hydroden halides HF,HCI,HBr,HI? According to the logistics equation
p'(t) = 6 p(t) [5-p(t)]. Find the population at which the population growth rate is a maximum.?

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