1520+1630+1480+1580+1400+1300+1700+1610+1580+1520 divded by10
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A sideways opening parabola is in the form 
, so we know from the process of elimination that it will either be b or c. Next we have to realize that if the parabola opens to the left it is a negative parabola, just like if a parabola opens upside down it is a negative parabola. So the one that has the negative out front is b.