I think you might need Desmos for graphing?? Explain your answer!

Yes you are correct! This equation will make a parabola. The width when the arch is at ground level would be the x-intercepts, or zeros, of the parabola.

The vertex point is (0,12)

the axis of symmetry is 0

The zeros are (-4,0) and (4,0)

using the zeros take away the negative because something cant be negative feet wide and add the numbers together (4+4)

Your answer is 8

i attached the graph

Hope this helps you!

P.S. Can i get brainliest? :)