Which could be the equation of the parabola? A parabola with a vertex at (0,0) has a directrix that
crosses the negative part of the y-axis,
O x2 = -4y
O x² = 4y
O y2 = 4x
O y2 = -4x

the answer is b.

step-by-step explanation:

by the trigonometric ratio tangent, tangent equals opposite divided by adjacent.

therefore, tan(50) equals ac/3

multiply each side by 3 to get: ac=3tan(50)

the answer is b.

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol