9514 1404 393
Answer:
   a = 9 meters
Step-by-step explanation:
The perimeter is the sum of the side lengths:
   28 m = a + 2m + a + 8m
   18 m = 2a . . . . . . . . . . . . . . . . subtract 10m, collect terms
   9 m = a . . . . . . . . . . . . . . . divide by 2
The value of a is 9 meters.
 
        
             
        
        
        
Answer:
Closed boundary point 
Step-by-step explanation:
It says greater than OR equal too and having a closed boundary will indicate that 21 is apart of the inequality also.
I hope this helps 
 
        
             
        
        
        
Answer:
Cos^2x csc^2x
Step-by-step explanation:
Cos^2x (1 + cot^2x)