Answer:
Since we know that ABCD ~ EFGH, we have the ratios:
EF/AB = GH/CD
=> 0.4/1.2 = x/1.8
=> x = (1.8 . 0.4)/1.2 = 0.6
So x = 0.6
 
        
             
        
        
        
Answer:
The percent of the area under the density curve where  is more that 3 is 25 %.
 is more that 3 is 25 %.
Step-by-step explanation:
Since the density curve is a linear function, the area under the curve can be calculated by the geometric formula for a triangle, defined by the following expression: 
 (1)
 (1)
Where:
 - Area, in square units.
 - Area, in square units.
 - Base of the triangle, in units.
 - Base of the triangle, in units.
 - Height of the triangle, in units.
 - Height of the triangle, in units. 
The percent of the area is the ratio of triangle areas under the density curve multiplied by 100 per cent, that is:


The percent of the area under the density curve where  is more that 3 is 25 %.
 is more that 3 is 25 %.
 
        
             
        
        
        
Answer:
455
Step-by-step explanation:
multiply the width by the length
 
        
             
        
        
        
All possibilities = 9! 
possibilities that harry sits at an end = 8! + 8! 
possibilities that harry doesn't sit at an end = 9! - 8! -8!