A parabola has a focus of F (8.5,-4) and a directrix of x=9.5.

What is the equation of the parabola?

A) 1/2 y² + 4y - 1 = x

B) - 1/2y² - 4y + 1 = x

C) 1/2y² - 4y+1=x

D) - 1/2y² + 4y-1=x

What is bigger 4/5 or. 71

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