Use Pythagoras theorem

Two triangles are similar

(6+3)*12/2 - 6*8 /2 = 30
 
        
        
        
12+2+8+6+57=85
85/5= 17
mean=17
        
                    
             
        
        
        
Answer:
The Missing Length = 7
Step-by-step explanation:
Equation: side length x side length = area
- This means that if you divide the area by one of the side lengths, you'll find the other
1.  Convert the numbers into decimals 
- 8 3/4 -  8.75 (area)
- 1 1/4  = 1.25 (side length)
2. Divide the <u>area</u> by the <u>side length</u>
<u></u>
<u>7</u> is the answer.
 
        
             
        
        
        
Answer:
1 1/2
Step-by-step explanation:
3 1/2 / 2 1/3