The line is called the directrix. Here we have a vertical directrix, so a parabola sideways from usual.
Geometry is best done with squared distances. The squared distance from an arbitrary point (x,y) to the vertical line x=2 is

We equate that to the squared distance of (x,y) to the focus (-2,0):



We could call that done. A more standard form might be
Answer:
question 12 is answer B
question 13 is -8x^3
Step-by-step explanation:
exponent rule 
Answer:
22/7 * 3 * 3 * 6 ~ 169.65 cubic centimeters
Answer: f=26
Step-by-step explanation: x^2+6x^2+12x+7/x= 26
Answer:
<h2>This value is called the common difference</h2>
Step-by-step explanation:
The common difference is the constant value which is repeatedly added to each term in an arithmetic sequence to obtain the next term, it is basically the difference between consecutive numbers
To find the common difference we can subtract the previous term from the first time or the second to the last term from the last term, the idea of finding the common difference is basically subtracting the previous term form the subsequent term.