Answer:
13
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The equivalent to -(-5.25) = 5.25
Step-by-step explanation:
Given

We need to determine the equivalent to -(-5.25)
some of the sign rules are:
+(+) = +      
−(−) = +
+(−) = -
−(+) = -
Thus, 

Applying the rule: -a(-a) = a

Therefore, the equivalent to -(-5.25) = 5.25
 
        
                    
             
        
        
        
The value of X would be 3.6 because if you divide the 4 by 2 to get the half triangle you now know the base and height for the triangle. Now you have to use tangent -1 to figure out the bottom right angle which is 56.3 degrees. Once you have the angle you can use Sin to figure out the missing side.