Find the geometric mean of 5/2 and 40

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Why is x= 4 a solution to the proportion 14/x 56/1 6