What is the answer to (a) and (b) i've tried most possible options but it counts me wrong.

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Complete the steps to find 4.830 ÷ 5