1) Because the quadratic function passes through the origin, (0,0) m =1or 2 is brought in. Because it is a quadratic function, m=2.

So y=-0.25xx+2.5x so b: (2,4)

2)OB is y= 2x.

Therefore, if OD is y=4x, it is not difficult to find that OC is one = 1/3*x and there is a part of C on the parabola where x is greater than zero, so Xc=34/3 Xp=68/9.

It's about time. I have not finished my words yet. pity ...