You need to look at the x values when you calculate that.
There is a line which goes from -2 to 0. Another line at 0 to 4 and the last line is 7 to infinity.
You can combine the first two and get B) (-2, 4] and [7, infinity)
        
                    
             
        
        
        
Step-by-step explanation:
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Answer:
36 units
Step-by-step explanation:
area of right angle triangle =1/2* b*h. 
by counting the square,b=8 units and h=9 units
therefore,area 1/2* 8units * 9units
 1/2*72units^2
 36units^3