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The temperature in Celsius(degrees) at the point (x,y,z) where x, y, z are measured in meters given by T(x,y,z)=1/x^2+2y^2+3z^2.
a) Find the rate of change in temperature at the point P(1,0,-1) in the direction toward the point Q(2,1,-2).
b) In what direction does the temperature increase fastest at P.
c) Find the maximum rate of increase at P.
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If F is a field, prove that the field of fractions of F[[x]] is the ring F((x)) of formal Laurent series. Show that the field of fractions of the power series ring Z[[x]] is properly contained in the field of Laurent series Q((x)).
Permutation and combination to find number of ways
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Compute the mean & the standard deviation of the total amount that this investor in 1 year from these four investments.
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