1/3 + 2/5 • 2/3
2 • 2 = 4
5 • 3 = 15
1/3 = 5/15
5/15 + 4/15 = 9/15 = 3/5
1/3 + 2/5 • 2/3 = 3/5
        
             
        
        
        
Break the shape into 2 along the perforated line. now you have two rectangular prisms. find the volume of each and add them together to get your answer.
Rectangular prism: length*width*height
RP1) 10*8*14=1120
RP2) 10*10*8=800
total: 1920
        
             
        
        
        
If there is 23 classrooms and each has 10 then you would have to times 23 by 10 - 23x10=230
        
                    
             
        
        
        
Answer:
Sum of interior angles of polygon = (n-2)*180
1) Pentagon:
2)Hexagon:
3) Heptagon:
4) Octagon: