Unanswered Cartesian Coordinates Questions

2.the girder of a railway bridge is a parabola with its vertex at the highest point 15m above the ends.if the span is 120 m find the height of the bridge at 24m from the middle point. ...

If m1 and m2 are the roots of the equation x^2+(√3+2)x+√3-1=0.then find the area of the triangle formed by the lines y=m1x,y=m2x and y=c. ...