Answer:
Step-by-step explanation: see attachment below
For this case we have the following polynomial:

The standard form of the polynomial is given by:

Where, the axis of symmetry of the polynomial is given by the expression:
}
In this case we have:

Therefore, replacing values we have:

Rewriting we have:

Answer:
The symmetry axis of the polynomial is given by:

option C
Answer: The number before the decimal
Step-by-step explanation:
The algebraic expression of "Four more than the quotient of a number and 3 is 9" is 
The value of x=15
Step-by-step explanation:
We need to express "Four more than the quotient of a number and 3 is 9" as algebraic expression.
Let the number = x
Solving:
quotient of a number and 3: 
Four more than the quotient of a number and 3: 
Four more than the quotient of a number and 3 is 9: 
Now, finding value of x:

So, value of x = 15
Keywords: Algebraic expression
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