Answer:
9
Step-by-step explanation:
It is 9 because 9x7=63.
18+45=63
Answer:
B) 
Step-by-step explanation:
∠4 and ∠2 are vertical angles as well, but since they are already used, all that are left to use are ∠3 and ∠1, which are the other vertical angles.
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Answer:
17
Step-by-step explanation:
Answer:37
Step-by-step explanation:
If the part inside the square root is negative, there are imaginary roots. Otherwise they are real.