The first one is the inverse of x.
        
                    
             
        
        
        
Answer:
https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-data-statistics/cc-6-mad/v/mean-absolute-deviation
Step-by-step explanation:
the absolute deviation is 2.75
 
        
             
        
        
        
1-2:<span>Yes. But not all parallelograms are squares</span><span>
3-false ! are </span><span>plane figures.
4-True ! </span>Every square is a rhombus<span>
5-False , </span><span>every rhombus is not a square.
6-7 : </span>Yes, all Squares are rectangles, but not all rectangles are squares because it needs to have all equal sides.
        
             
        
        
        
Answer:
 ever find the answer? I cant manage to find it 
 
        
             
        
        
        
Answer:
x = 3
Step-by-step explanation:
We can solve this by using ratios of similar triangles
3           x
------ = ------------
3+9           12
3           x
------ = ------------
12           12
x must equal 3 to keep the ratios the same