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

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

16.9 times 2.85

step-by-step explanation:

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled