Find the equation of a parabola with a focus of (0, 9) and directrix y = –9. A. Y= - 1/9x^2
B. Y= 1/36x^2
C. Y= - 1/36^2
D. Y= 1/9^2

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2