Use the formula 
x
=
−
b
2
a
x
=
-
b
2
a
 to find the maximum and minimum.
(
−
3
4
,
41
8
)
        
             
        
        
        
Answer:
2340
Step-by-step explanation:
Formulae for sum of interior angles is 180(n-2)
Whereby n=number of sides 

 
        
             
        
        
        
Answer:
Volume of a prism =BH
(length ×width)×height  
(10×20)×60
=12000cm3 
Step-by-step explanation: