- Definition of: positive acceleration?

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Whats the van't hoff factor of cacl2? How was the cov( X(s), X(t)) obtained. i know that E[x(s)] * E[x(t)] = 0 but i don't know how to calculate E[x(s) x(t)]? 2 sounds of 3000Hz & 6000Hz frequencies emerge from .50m diameter circular opening of speaker. Find diffraction angle for sound of each freq? P(x ≤ 60) that x is a normal variable with mean of 49, and standard deviation of 7.1? If z lies on |z|=2 show that |1/z^4-4z^2+3|<=1/3?