Answer:

Step-by-step explanation:
we know that
The <u>Triangle Inequality Theorem</u> states that the sum of any 2 sides of a triangle must be greater than the measure of the third side
so
Applying the Theorem
case 1) 



case 2) 


-----> rewrite
case 3) 



therefore

9. -7/12
10. -2.75
11. 1.844
12. 4.539
Answer:
From (2, 1) move up one and over four
The third one: No, yes, no
I ain't gonna explain how I got to this cuz I'm quite tired rn but trust me the answer is 2c²