What is the equation of the parabola, in vertex form, with focus at (1,-4) and
directrix x= 3?

D.

Step-by-step explanation:

1) according to the definition of parabola d(focus)=f(directrix),

2) then

3) after evoluation the equation:

(y+4)²=-4x+8 or (y+4)²= -4(x-2);

4) correct answer is D.

segment bisector

step-by-step explanation:

line segment bisector. definition: a line, ray or segment which cuts another line segment into two equal parts. try this drag one of the orange dots at a or b and note the the line ab always divides the line pq into two equal parts.

mark brainliest!