Answer:
5x+ 4
Step-by-step explanation:
First, put all of the x variables together. So 3x+4x=7x 
7x + 4 -2x  Since the 2x is negative you can subtract it from 7x and get 5x.
you can not add the four to the 5x because it does not have a matching variable.
So, you have: 5x+ 4
 
        
             
        
        
        
First, solve the parenthesis
Remember to follow PEMDAS, and the left-> right rule
12/3 = 4
4 x 2 = 8
8 + 3 = 11
11 - 7 = 4
Square the remaining number
4² = 4 x 4 = 16
16 is your answer
hope this helps
 
        
             
        
        
        
The defenition of a rectangle is that it has 4 angles that measure 90 degrees
ther are infinite legnths and inifinite numbers
intinite side legnths so infinite number of unique rectangles
        
                    
             
        
        
        
5+4 = 10 - 1 
the missing number is 1