Mathematics, 04.04.2020 07:02, episodegirl903

Find an equation in standard form for the hyperbola with vertices at (0, +/- 9) and foci at (0, +/-10).

A. y^2/81 - x^2/100 = 1
B. y^2/81 - x^2/19 = 1
C. y^2/19 - x^2/81 = 1
D. y^2/100 - x^2/81 = 1

Find the standard form of the equation of the parabola with a focus at (0, -10) and a directrix at y = 10.
A. y = -1/10 x^2
B. y = -1/40 x^2
C. y^2 = -40x
D. y^2 = -10x

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Find an equation in standard form for the hyperbola with vertices at (0, +/- 9) and foci at (0, +/-1...