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Were I the grader I probably would take off a little bit, not enough to affect anything severely though. The arrows simply show that you've remembered that parabolae are infinite.
keywords: the,put,of,algebra,end,didnt,parabola,my,if,get,on,Thank,off,points,at,taken,Would,arrows,regents,Would I get points taken off if i didnt put arrows at the end of my parabola on the algebra regents? Thank u!