The vertex of the parabola is between the shortest line connecting its focus and directrix, so between (0, -4) and y = 4 is the point (0, 0), which is the vertex of the parabola. Also, this parabola faces downward.
The general formula for a parabola that faces downward is y = -4cx^2, where c is the distance from the vertex to either to focus or the parabola. Since c = 4, the equation is y = -16x^2, which is choice A.
Option A
Opposite angles in a cyclic quadrilateral add up to 180°
So
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x and 133 are opposite angles
Part A is done after part B
Answer: The equation has a positive y-intercept
This is because the constant is +10
