Answer:yes
Step-by-step explanation:
 
        
                    
             
        
        
        
A b=-105  
a+b=8  
 x²+8x-105=0
x²+-7x+15x-105=0
x(x-7)+15(x-7)=0
(x-7)(x+15)=0     
a=-7
b=15
        
             
        
        
        
divide 8 into 3
     0.375
8 | 3.000
     2 4
     -----
        60
        56
        ----
          40
          40
          ----
            0
0.375 is a decimal
times it by 100 to get percent = 37.5 %
(when you times decimals by 100 you simply move the decimal over two places right)
 
        
                    
             
        
        
        
<h3>
Answer:  7.20</h3>
Work Shown:
18% = 18/100 = 0.18
18% of 40 = 0.18*40 = 7.20
 
        
        
        
The length is 12, because if it's 9 inches wide it has two sides of 9 inches which is 18. Then subtract that from the intial value 42 to get 24. After, you divide 24 by 2 due to there being 2 sides of the box and 24 is the sum of both sides. Hopethis helps!