First one: Exact Form:
- 2 √2-√3-√6-√2/4
Decimal Form:
0.70710678...
17 and 3 are the two numbers
Answer:

Step-by-step explanation:
You need to subtract the coefficients to get the answer.
Let's look at the equation...

The coefficient is 3 and 1
So, you do 3-1
You get 2
So...
I think the answer is
No
No
Yes
But I'm not sure about the last one
Answer:
√85
Step-by-step explanation:
a² + b² = c²
6² + b² = 11²
36 + b² = 121
b² = 121 - 36
b² = 85
b = √85