Answer:
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Step-by-step explanation:
Answer: D. 7^11
Reason:
The rule we use is 
When multiplying exponentials of the same base, we add the exponents.
The exponents 5 and 6 add to 5+6 = 11
So,

The base stays the same the entire time.
In any cyclic quadrilateral, angles opposite one another are supplementary, meaning

and given that
, we have
.
By the inscribed angle theorem,


and since

we have

and it follows that
