2,825 i am almost sure this is the right answer i apologize if not
        
             
        
        
        
Undefined is the answer for me. Lol
        
                    
             
        
        
        
Answer:
9 bags
Step-by-step explanation:
First we will need to calculate the area of their entire backyard, which has a shape of trapezium.
So the formula for the area of a trapezium is 
 a and b are the lenghts of the parallel sides and h is the height. 
From the picture 
Then we plug into our formula
 square feet
 square feet
To get the number of bags required we just simply divide the aree of their entire yard by the space that 1 bag covers. We get:
 bags
 bags
This is more than 8 bags so they will need 9 bags to cover their entire yard.
 
        
             
        
        
        
Answer:
6.4
Step-by-step explanation:
9x-23=4x+9
5x=32
x=6.4
If I'm right, brainliest pls?