Question 1208180
<pre>
Very easy!  The answer is obviously 75.  Here's why:

(a)  6x5=30, substitute in the quadratic expression:

{{{83x^2-3137x+10800}}}
{{{83(30)^2-3137(30)+10800}}}
{{{83(900)-94110+10800}}}
{{{74700-94110+10800}}}
{{{-8610}}}
then divide by -210, get 41

(b)  7+2=9, substitute in the quadratic expression:

{{{83x^2-3137x+10800}}}
{{{83(9)^2-3137(9)+10800}}}
{{{83(81)-28233+10800}}}
{{{6723-28233+10800}}}
{{{-10710}}}
then divide by -210, get 51

(c)  2+2=4, substitute in the quadratic expression:

{{{83x^2-3137x+10800}}}
{{{83(4)^2-3137(4)+10800}}}
{{{83(16)-12548+10800}}}
{{{1328-12548+10800}}}
{{{-420}}}
then divide by -210, get 2

(d)  5x5=25, substitute in the quadratic expression:

{{{83x^2-3137x+10800}}}
{{{83(25)^2-3137(25)+10800}}}
{{{83(625)-78425+10800}}}
{{{51875-78425+10800}}}
{{{-15750}}}
then divide by -210, get 75

Simple, huh?  Perfectly logical!  <font face="wingdings" size=7>J</font>  

Edwin</pre>