I'm pretty sure it's B. rotational
Answer: 
<u>Subtract 3/8x from both sides</u>
<u></u>
<u></u>
<u></u>
<u></u>
<u></u>
<u>Subtract 2 from both sides</u>
<u></u>
<u></u>
<u></u>
<u></u>
<u></u>
<u>Multiply both sides by 8/3</u>
<u></u>
<u></u>
Answer:
<h2><u><em>
a = 17°</em></u></h2>
Step-by-step explanation:
it is a parallelogram, the opposite angles are the same size
so
4a + 64 = 8a - 4
64 + 4 = 4a
68 = 4a
a = 68 : 4
a = 17