Worth 50 point
if a vertical parabola opens upward, has its vertex in the third quadrant, and y=ax2+bx+c is the equation of this parabola, which of the following can be true? sketch a curve for each possible case.
(just write true or false for each case)
a)a< 0, b< 0, and c< 0
b)a> 0, b> 0, and c> 0
c)a> 0, b< 0, and c> 0
d)a< 0, b> 0, and c> 0
e)a< 0, b> 0, and c< 0
f)a> 0, b< 0, and c< 0