The x-coordinate of the vertex can be found by -b/2a where the equation is ax^2 + bx + c
3x^2 + 6x + 3
b is 6, and a is 3
-b/2a = -6/2(3) = -6/6 = -1
The x-coordinate of the vertex is -1. To find the y-coordinate plug the x-coordinate into the equation and solve for y.
f(-1) = 3(-1)^2 + 6(-1) + 3
= 3(1) - 6 + 3
= 3 - 6 + 3
= 0
The y-coordinate is 0
The vertex is (-1, 0)
        
             
        
        
        
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Answer:
concrete operational stage
Step-by-step explanation:
Have a look at the attached photo below, it may be your full question: 
The concrete operational stage is the third phase in Piaget's cognitive development theory. This period spans the period between childhood, it begins around 7 years of age and continues until about 11 years of age and is characterized by the development of logical thinking.
 
        
             
        
        
        
Answer:
use cymath for answer
Step-by-step explanation:
it will explain better
 
        
                    
             
        
        
        
All you have to do is multiply 84 by 25%
And that's your answer.
I hope this helped