Three of four numbers have a sum of 22. if the average of the four numbers is 8, what's the fourth number

Restrictions on f(x) = 1/x+5 and g(x) = x-2

Ten times the square of a non-zero number is eqaul to ninety times the number

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