If a ball is thrown at a velocity of 75 ft/sec at an angle of 25 degrees with horizontal, and the ball is released 5 feet above ground, how do I find the angle needed when X = 215?

I Set the equation 215 = (75 cos X)t but there are two variables so I don't know how to solve it.

If an airplane flying at an altitiude of 3500 feet is dropping supplies, the path of the plane is parallel to the ground as the supplies are released while it travels 300mph, what are the parametric equations that represents this?