Math
posted by Alex .
Someone please explain these!
The angle between two planes is defined as the angle between their normals. Determine the angle theta between 0 and 90 degrees between the given planes.
a) 2x+3yz+9 = 0 and x+2y+4 = 0

If the positive zaxiz points up, show that the line x=0, y=t, z=2t is parallel to and below the plane 2x10y+5z1 = 0.

Find an equation for the set of points P(x,y,z) that are equidistant from the points A(1,2,3) and B(4,0,1)
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