6-x = 10 what is the answer and explain the steps

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

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1