问题99: Shape of a skateboard ramp. The diagram shows part of the cross section of a skateboard ramp.
Shape of a skateboard ramp. The diagram shows part of the cross section of a skateboard ramp. The height, $y$ metres, of the ramp can be modelled by the equation $y=\frac{9}{80} x^2-\frac{13}{5} x$, where $x$ is the horizontal distance from the point $O$ in metres.