How many times can 22 go into our 198

Which rotation about its center will carry a regular hexagon onto itself

Which equation shows an equation equivalent to x^2+12x+7=0

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin