the vertex of this parabola is at (-1 -3). which of the following could be its equation? A: x=-2(y-1)^2-3 B: x=-2(y+1)^2-3 C: x=-2(y-3)^2-1 D: x=-2(y+3)^2-1

Acertain drug is made from only two ingredients: compound a and compound b. there are 3 millimeters of compound a used for every 4 millimeters of compound b. if a chemist wants to make 693 milliliters of the drug, how many milliliters of compound a are needed?