Answer:
12
Step-by-step explanation:
 
        
             
        
        
        
Answer:
20 inches x 26 inches
Step-by-step explanation:
set up an equation: (2x)(x+7)=520
now just solve it
2x^2+14x=520
x^2+7x-260 = 0 
factor: (x-13)(x+20)
x = 13 and -20
13 is the only one that works because you can't have a negative side length
13+7=20
13*2=26
lmk if you don't understand how to solve that equation
 
        
             
        
        
        
Answer:
1 solution, 0
Step-by-step explanation:
In algebra, a variable can be equal to any amount of numbers depending on how it is used. In this case, m is only equal to the one value of 8, and therefore only has <u>one solution.</u>
m - 8
(8) - 8
0
 
        
             
        
        
        
Answer:3 boxes.
Explanation: $21 / $7=3 boxes
        
                    
             
        
        
        
N/A
Step-by-step explanation: Just pay attention Haden