A child is flying a kite and has let out all the 80 feet of the kite's string. The kite is 35 feet above a stop sign. How far is
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The axis of symmetry of a parabola in the form
is a vertical line
where k is the x coordinate of the vertex of the parabola.
The x coordinate of the vertex of the parabola is given by
which in your case is
So, the axis of symmetry is the line x=12.