count show Σak+b = aΣk + nb where k=1 to n

prob stat: 2 ways The mean of five #s 2,3,5,6,8 is 4.8. Calculate the std deviation.

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Solve the differential equation cos^2(y) dx +(1+e^(-x) sin(y) dy=0

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2nd way: lim ((1+h)^3-1)/x? as h →0

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