Look here in a square which is what I imagine that drawing is all the angles are 90 degrees. A rectangle would be knowing two angles is know all of them one way or another so fix your work and you should know the answer
 
        
                    
             
        
        
        
23 is your answer. IT's 22.8 but rounded up its 23
        
                    
             
        
        
        
ANSWER:
5a+2b
add the like terms together