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Find the quadratic function f(x)=ax^2+bx+c that goes through (3, 0) and has a local maximum at (0, 1) [Calculus]? How to solve ((cosxy)+(x/y))dx+1+((x/y)cos(x/y))dy=0 please help? (1 pt) Find the equation of the tangent plane to the surface determined by
x^4y^3+z−25=0? Find the area of the region between the curves x=1−y2 and x=y2−1. I'm a little confused because of the x= not y= and still can't figure it!? 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!?