Brainliest+20 !
which statements are true about parabolas represented by the equation
y=ax²+bx+c?
select four that apply.
if a> 0, then the parabola opens up.
if a> 0, then the parabola has a minimum.
if a< 0, then the parabola opens down.
if a> 0, then the parabola has a maximum.