Please help

From the window of a building, a ball is tossed from a height yo above the ground with an initial velocity of 7.80 m/s and angle of 16.0 below the horizontal. It strikes the ground 4.00 s later. (a) If the base of the building is taken to be the origin of the coordinates, with upward the positive y-direction, what are the initial coordinates of the ball? (Use the following as necessary: yo. Assume SI units. Do not substitute numerical values; use variables only.) X; y; = (b) With the positive x-direction chosen to be out the window, find the x- and y-components of the initial velocity. Vi, x = m/s Viy m/s (c) Find the equations for the x- and y-components of the position as functions of time. (Use the following as necessary: y, and t. Assume SI units.) X = m y : m (d) How far horizontally from the base of the building does the ball strike the ground? 29.9 m (e) Find the height from which the ball was thrown. m (f) How long does it take the ball to reach a point 10.0 m below the level of launching