Answer:
7 inches.
Step-by-step explanation:
Longest book length - Shortest book length


 
        
             
        
        
        
Ok the ladder and the ground will make a right triangle/right angle. This is because the ground is flat, the wall is straight and only the ladder is leaning/slanted. I hope this helps.
        
                    
             
        
        
        
The subtraction sign in front of the second set of parenthesis changes the signs on the terms inside those parenthesis.  So this could be rewritten as  

.  None of the exponents on the x are the same, so we will just express it in terms of descending powers of x.   

.   This is also the same as  

  if you don't like to start with a negative.  Either one is correct.
 
        
        
        
Answer:
x=3/4, -3/4
Step-by-step explanation:
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➷ 3x + 1 = 511
Subtract 1 from both sides:
3x = 510
Divide both sides by 3:
x = 170
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