Help with 3 Geometry Questions

Hello everyone!

I've spent hours trying to figure out these last few Geometry questions and I can't seem to find any information on it in my text book. If anyone could offer some help I would really appreciate it. Thank you so much!

1. In the diagram below, ABCD is a parallelogram. What is Angle BEC?

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2. What is the value of x in the diagram below?

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3. What are the values of n and t in the kite below?

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a. n= 4 t= 39

b. n= 4 t= 51

c. n= 4.5 t= 39

d. n=4.5 t= 51