.Solving for Initial Velocity: Kinematic Equations

[brockp949]

how to get to Vo = the square root of ((xa)/(sin2theta))
from the kinematic equations or form SinTheta =Voy/Vo CosTheta =Vox/Vo

just really confused. I am writing a formal lab for my final and what I am asking is find the initial velocity it would take for the object to hit the target as a given angel

 

[brockp949]

i have tried to derive the kinematics formulas as well as the sectors for the initial velocity