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In [mg2170] txp at pi.net (JanHolland)
 writes:
<Say GTK = ATC = Average Total Cost := 1/3 q^2 - 10 q + 100

When I give Plot[GTK,{q,0,30}] the resulting graph gives a minimum
below to X-axis at aboutq=15

When I give q=15 and N[GTK] it evaluates correctly to GTK=25.

What am I doing wrong ?>

======================================

Try Plot[gtk,{q,0,30},PlotRange->{0,100}];

Mathematica, for its own reasons, wants to plot the graph with axes chosen
differently than seems natural to you.

Hugh Walker
Physics
Univ of Houston




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