PLEASE HELP What is the equation of the directrix for the following parabola: -8(x-5)=(y+1)^2 a. y=-3
b. x=7
c. y=7
d. x=-3

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.