- Can you add multiply and divide in your mind no caculator?

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Which form of balance sheet presents vertically all elements ? How exercise impact breathing ins hypothetical situation where blood had a normal ph of 6.1 instead of 7.2? 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)]? Find the point on the parabola x+y^2=0that is closest to the point (0,-3)? Audio system produces intensity of 100 dB & another audio system produces intensity of 103dB. Calculate intensity ratio of two audio systems?