If the parabola is f(x) = ax^2 + bx + cthen f(x) + k shifts up by k.
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If you can mash the equation for the parabola into the form Y = Ax2 + Bx + C, then the parabola opens up if 'A' is positive, and down if 'A' is negative.
down
It is an up parabola.
No. A parabola can open up or down.
Vertex