<PRE><B>Question 37071</B>
(200-15x)(50+5x)=R
R=-75x^2+250x+10000
To find the maximum value of R
either graph the function or 
use x=-b/2a and the corresponding
R value.  If you do the latter you
will find that x=-b/2a=1.667 and the 
corresponding R value will be 10208.33.
So,
The equation is correct.  The maximum R is not.
The maximum point of the graph is (1.667, 10208.33)
The maximum revenue is $10,208.33
Cheers,
Stan H.</PRE>