Choose all of the equations that are true.

x2 + 2x − 24 = (x + 6)(x − 4)
x2 − 8x + 15 = (x + 5)(x + 3)
3x2 + 4x + 1 = (3x + 1)(x + 1)
5x2 − 2x − 3 = (5x + 3)(x − 1)
4x2 − 49 = (2x − 7)(2x + 7)

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