Find the standard form of the equation of the parabola with a vertex at the origin and a focus at (0, -7).
select one:
a. y = -1/7 x^2
b. y^2 = -7x
c. y = -1/28 x^2
d. y^2 = -28x

D

Step-by-step explanation:

I got (-7,0) for the focus & Origin: (0,0)

∠acb = 8°

step-by-step explanation:

∠xba lies on the circle and is half the measure of the intercepted arc ax

hence

measure of arc ax = 2 × 42° = 84°

∠acb is outside the circle and is

∠acb = (arcab - arcax ), hence

∠acb = 0.5 (100 - 84) = 0.5 × 16° = 8°