Well 6^2 = 36 and (8-4)^2 = 16 so you would do 16 + 7 which is 23 and then 36 - 23 = 13.
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:
She made an error in step 1.
Step-by-step explanation:
The formula of a cylinder is V=πr^2 h
The radius is 5cm and the height is 12cm
V=π5^2 12
V=300π cm cubed
Your answer is B) V=300π cm cubed