You don't need both. GPE is the gravitational potential energy caused by the fact that an object is not touching the ground of the earth. KE is caused by an object moving. This problem says that the bowling ball "sits" meaning that you only need the GPE because it's not moving and it is not touching the surface. You would use the GPE equation to find how much Potential energy an object has. If you want its velocity, you would set the answer to the GPE equation equal to the KE equation to find its velocity.
Go with the last one because you need potential energy for kinetic energy
Answer:
60 deg from Y-axis is 150 deg from X-axis
x = L cos theta = 23,2 cos 150 = -.867 * 23.2 = -20.1
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