maximum point :)
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if it opens up then the point is called the minimum if it opens down its called the maximum
The given terms can't be an equation without an equality sign but a negative parabola opens down wards whereas a positive parabola opens up wards.
If the equation of the parabola isy = ax^2 + bx + c, then it opens above when a>0 and opens below when a<0. [If a = 0 then the equation describes a straight line, and not a parabola!].
regular hours is usually when a store opens and closes
Well, darling, a door is typically rectangular in shape. But hey, if you're feeling fancy, you can always opt for a round door like they have in hobbit holes. Just make sure it opens and closes, that's the important part.