The value of the expression
is 
<h3>How to evaluate the sum?</h3>
The attachment represents the proper format of the question
The summation expression is given as:

Expand the radicands

Evaluate the square roots

Add the like terms

Hence, the value of the expression
is 
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Answer:
9
Step-by-step explanation:
You take 12 and subtract 8. You should get 4. Then you divide 36 by 4 and you get 9. So, 12 - 8 x 4 = 36.
Answer: the missing part is 45
suppose: the missing part is x
we use Thales theorem:

Step-by-step explanation:
Answer:
2
Step-by-step explanation:
9hours x 60minutes = 540 minutes
(Presuming he actually sat and read the whole time)