SOMEONE PLZ HELP ME I BEG OF YOU

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?