Step-by-step explanation:
steps are in picture above.
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Answer:
A) 
B) 
Step-by-step explanation:
A) You can add these expression because they contain the same square root:

B) Same as above:

Answer: I believe it's 5 I am not sure
Step-by-step explanation:
Multiply the top one by 3 for x, so you can eliminate x and find y
then plug in the y into one of the equations to find x