What are the focus and directrix of the parabola with the equation y=1/12 x^2

The graph of this parabola is shown below. From this graph we know that:

VERTEX:

DIRECTIX:

Since the vertex lies on the origin and the parabola opens upward, then the standard form of this parabola is:

So:

Then the directrix is:

answer: bearing in mind that a rectangle has a perimeter of length + length + width + width.

step-by-step explanation:

p = perimeter

l = length

x=width

p = 2l + 2x

p = 2(l+x)     < ==== perimeter of the base of the box.

is there more to this question?