I got 6 units^2. So the answer is the second choice. ab/2 = 3*4/2 = 6.
        
                    
             
        
        
        
Answer:
52 × 2 - 31 = 73
Step-by-step explanation:
Use PEMDAS 
The way I remember is like this..
Please (Parentheses)
Excuse (Exponents)
My (Multiication)
Dear (Division)
Aunt (Addition)
Sally (Subtraction)
Multiply 52 × 2
which gives you 104.
Then subtract 31 from 101
and that will give you 73.
 
        
             
        
        
        
Answer:
  Option A is the correct answer.
Step-by-step explanation:
  The sum of interior angles of a polygon is given by (n-2) x 180°, where n is the number of sides.
  The sum of interior angles will not affect irregularity of polygon, it is same for regular and irregular polygon.
  For a pentagon n =5.
  Sum of interior angles = (5-2) x 180 = 3 x 180 = 540°
   Option A is the correct answer.