Question 1204101
<br>
Working in 2 dimensions, let the origin of the graph of the parabola be the vertex.  The equation is then of the form {{{y=ax^2}}}.<br>
The edges of the dish are at the points (-42,7) and (42,7).  Determine the value of the coefficient a using either of those two points.<br>
{{{7=a(42^2)}}}
{{{a=7/42^2=1/(42*6)=1/252}}}<br>
ANSWER: {{{y=(1/252)x^2}}}<br>