Answer:
See the proof below
Step-by-step explanation:
Let the line AB be a straight line on the parallelogram. 
A dissection of the line (using the perpendicular line X) gives:
AY ≅ BX 
Another way will be using the angles. 
The angles are equal - vertically opposite angles
Hence the line  AY ≅ BX (Proved)
 
        
                    
             
        
        
        
Answer:
27
Step-by-step explanation:
        Let <em>g </em>be Gabrielle's age and <em>m </em>be Mikhail's age.
        We can turn the statements the problem gives us into mathematical expressions to help us solve.
        Gabrielle's age is two times Mikhail's age:
                       <em>g </em>= 2<em>m</em>
        The sum of their ages is 81:
                       <em>g </em>+ <em>m </em>= 81
        This gives us a system of equations that will allow us to solve for Gabrielle's age.
<em>g </em>+ <em>m </em>= 81
(2<em>m</em>)<em> </em>+ <em>m </em>= 81
3<em>m </em>= 81
<em>m</em> = 
<em>m </em>= 27
        If we need to solve for Gabrielle's age, we can do the following.
 <em>g </em>= 2<em>m</em>
 2(27)<em> </em>= <em>g</em>
54 = <em>g</em>
g = 54
Mikhail's age is 27.
Gabrielle's age is 54.
 
        
                    
             
        
        
        
In order to factor this, we will need to take something out to get it to factor. Lets take out a greatest common factor, in this case our greatest common factor will be 3.
We will then write it as:
-3(5t+2)