Which quadratic equation is equivalent to (x – 4)2 – (x – 4) – 6 = 0? (u – 4)2 – (u – 4) – 6 = 0 where u = (x – 4) u2 – (u – 4) – 6 = 0 where u = (x – 4) u2 – 16 – u – 6 = 0 where u = (x – 4) u2 – u – 6 = 0 where u = (x – 4)

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