



 
Hi, Since it is a parabolic arch it is parabola opening downwards. I am going to place the base on the Xaxis and have it symmetric around the Yaxis. It will intersect the Yaxis at $y = 16$ and since the span is 20 feet it will intersect the Xaxis at $x = 10, x = 10.$ Hence its graph looks like
Can you write its equation from this information? Penny




Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 