Answer:
the base value for X in the math world is 1... but you cant see it. 
Step-by-step explanation:
 
        
             
        
        
        
Answer: 19.5
Step-by-step explanation:
Use Pythagorean theorem to find the diagonal as it is a right triangle. 
 
        
             
        
        
        
Get unknowns on one side and know on other side.
Divide both sides by -2
X= -7
        
             
        
        
        
Solution:
we are given that 
If G is the midpoint of FH,  it mean that 

we are also given that 

So we can write 

So 