There are no common factors except 1
Answer: Yes, it is 
Step-by-step explanation:
To simplify square roots, you can factor the number inside the square root into its lowest common denominators.

Any value that appears twice can be "taken out" of the square root and moved to the left of it:
,
What you are doing is essentially taking the square root of 4 and the square root of 3. Because the square root of 4 can be simplified, and the square root of 3 cannot, this is the most simplified version of the expression we can reach.
6) x= 2, angle = 90 degrees obviously
7) Im not sure on this one
8) x = 5
9) x = 1
The intersection of two planes is always a line
3 7/8 Converted into decimal equals 3.875
7/8 = 0.875 + 3