mr. harrison made sandwiches for a picnic. of the sandwiches he made, 1/6 of them were turkey sandwiches, mr. harrison added che
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now, this parabolic graph, has two zeros/solutions/x-intercepts, at -9 and 21.
for a quadratic equation, the vertex will be right in between the x-intercepts, namely in this case between -9 and 21, right in the middle, namely at 6, and is where the axis of symmetry is at, x = 6.