The expression sin x tan x + cos x is equivalent to which

1) sec^2x
2) csc^2x
3) sec^2x csc^2x
4) sec x

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