Recall the secant-tangent theorem, and you have
EA^2 = EC*CD
12^2 = 8*(x+10)
and now ED = EC+CD = 8+x+10
I suspect a typo somewhere in the murk above
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Answer:

Step-by-step explanation:
Complementary angles sum up to
.

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Answer:
the middle. because it'sthe intersection of the circles
Answer:
x = 10
Step-by-step explanation:
Since the two triangles are congruent, ∠B ≅ ∠E
50 = 5x
x = 10