What math do you mainly need to know in 7th grade

Simplify.7x + 3y - 2 + 6x + 1 + y squared 2 you! ; )

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

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3