- The intensity musical a sound varies as a square of the sound waves....?

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Given tan x=-3/4 where x the II-nd quadrant. Find sin (2x)? F(x) = (x-1)(x+2) find the domain, x-intercept, and y-intercept? How do we know if any other planets have oxygen in the atmosphere? If elements in the periodic table had personality, what would be Silicon? 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)]?