Answer:
12 sides
Step-by-step explanation:
To find the number of sides of a regular polygon with the sum of interior angles of 1800 degrees, we will follow the steps below;
first write down the formula for finding sum of the interior angle of a polygon
s= (n-2)180
where s is the sum of the interior angle and n is the number of side
from the question given, sum of the interior angle s=1800 degrees 
substitute s=1800 degree into the formula and solve for n
s= (n-2)180
1800 = (n-2)180
divide both-side of the equation by 180
1800/180 = n-2
10 = n - 2
add 2 to both-side of the equation
10 + 2 = n
12 = n
n= 12
The polygon have 12 sides
 
        
             
        
        
        
Answer:
5
Step-by-step explanation:
When two lines are crossed by another line (the transversal), the pair of angles on  the opposite and inner side of each of those two lines
are called Alternate Interior Angles.  Therefore 5 is the alternate interior angle to 4.
 
        
             
        
        
        
Remove unnecessary parenthesis.
-5k 3 - 6k +1 - 6k 2 + 5k (simplify each term) -15k - 6k + 1 - 12k +5k = -28k +1
Answer: 28k + 1
 
        
                    
             
        
        
        
Answer:
Y = X - 2 would be the answer.