If 12.6 was rounded, that means that it was rounded to the tenths place.
You know this because the number has one decimal place, so that must be what it was rounded to.
        
             
        
        
        
 The question has omitted  options but i will solve, so you will just check my answer from the options you have.
Answer: The equation  to find the value of x = 3x+ 2= 5x-4
 The value of x= 3
Step-by-step explanation:
Step 1
The sum of 3 times the value of x and 2 is equal to four less than five times the value of x can be expressed as 
 3x+ 2= 5x-4
 
 Step 2
Solving this equation  to find the value of x , we have that 
 3x+ 2= 5x-4
3x-5x= -4-2
-2x= -6
x= -6/-2
x=3
 
        
             
        
        
        
Answer:

Step-by-step explanation:
<u>Equation Solving</u>
We are given the equation:

It's required to solve it for a.
Swap sides to have the letter on the left side:

Divide by  :
:

 
        
             
        
        
        
You can find the perimeter of a circle by using the radius.
circumference = 2 

Circumference = 2 

circumference = 24 pi
Since you are only trying to find half of the circle you would divide your answer by 2 
24pi / 2 = 12 pi
12 pi = 37.68
The answer is B. 37.7
 
        
        
        
Answer: OPTION C.
Step-by-step explanation:
 Given the following expression:
 
 You can simplify this expression applying these steps:
 First step: You must apply Distributive property:
  
 
 Second step: You need to add the like terms. 
 Then, you get:
  
 
 You can observe that this simplified expression matches with the expression provided in Option C.