A
The volume (V) of a pyramid is found using the formula
V =  × area of base × height(h)
 × area of base × height(h)
area of base = 9² = 81 ← area of a square, hence
324 =  × 81 × h = 27h ( divide both sides by 27 )
 × 81 × h = 27h ( divide both sides by 27 )
h =  = 12 → A
 = 12 → A
 
        
             
        
        
        
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We are given –
 
  
 
- And also value of y's given. So, just put the value of y in the given equation. 
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- Henceforth, value of x is 7. 
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B. 12 assuming that it is a right triangle :)
        
             
        
        
        
Yes the lines are parallel