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Find the equation of the plane passing through the points (1,1,2) and (2,4,3) and perpendicular to the plane x-3y+7z+5=0.help me out thanks? How many 80 lbs.of concrete do i need for a 12 x 12 x 3 inches deep.? How much work must be done on a system to decrease its volume from 10.0 L to 3.0 L by exerting a constant pressure of 4.0 atm? The vector A=axi +ayj lies in which coordinate? What is the equation of the normal line to the curve 9x^3 - y^3 = 1 at point (1,2).?