When Alex rides his dirt bike off a ramp, his path can be modelled by h(d) = -392? + 13. 1d + 8.7, where d is the horizontal distance from the ramp and h is the height, both in metres. How far away from the ramp does he land, to the nearest tenth of a metre? Select one: O a. 79m O b. 2.0 m O c. 0.6 m O d. 3.9 m