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Calculus help? limit as x approaches negative infinity of (sqrt(9x^2+x)) -3x? Find a basis of the subspace of R4 that consists of all vectors perpendicular to both [1,0,0,7] and [0,1,-9,5]. Please show work!? How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help? Solve the equation 2cos(x+7pi/4)= square root of 3 ,which lie in [0,2pi) .find smallest and largest solution. Please show details ! Thanks? How can rates be converted to unit rates?