Answer: It’s the second one! 
Explanation: The dot is open and pointing to the side of the numbers greater than -3. It has to be an open dot because it is “greater than -3” not “greater than or equal to-3”! :)
        
             
        
        
        
Answer:
I think it's the top left one
Step-by-step explanation:
 
        
                    
             
        
        
        
ANSWER
By simplifying the left hand side using the Pythagorean Identity.
EXPLANATION
The given identity is 

Take the left hand side and simplify to get the right hand side.

Collect LCM for the denominators.

Recall the Pythagorean Identity.

This implies that:

We substitute this to get,


 
        
             
        
        
        
Answer:
23/24
Step-by-step explanation:
 
        
             
        
        
        
Answer:
 
Step-by-step explanation:
see the attached figure to better understand the problem
In the right triangle ABC
Applying the Pythagorean Theorem

substitute the given values
 
solve for BC
 
 
 