k, n - integers  
2k+1  - an odd integer
2n+1  - another odd integer
The product of them:
   (2k + 1)(2n + 1) = 
= 4kn + 2k + 2n + 1 = 
= 2(2kn + k + n) + 1
The product of integers (2kn) is integer
and the sum of them (2kn+k+n) also is integer
So  (2k + 1)(2n + 1)  = 2(2kn + k + n) + 1  is an odd integer
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Lines l and m are the parallel lines and 't' is a transversal line,
Therefore, ∠1 ≅ ∠5 [Corresponding angle postulate]
∠5 ≅ ∠7 [Vertical angles theorem]
∠1 ≅ ∠7 [Transitive property]
Therefore, ∠1 ≅ ∠7 [Alternate exterior angles theorem]
 
        
             
        
        
        
The answer is a i hope i helped
        
             
        
        
        
To attempt this algebraic equation we will be multiplying 4 to (3 - x) bracket so as to form the term on L.H.S. 



Combining like terms, we get, 




