Question 353639
{{{c(x) = x^2 - 22x + 166}}}
The average cost to produce {{{x}}} pumps is {{{c(x)}}}
Note that to produce {{{0}}} pumps
still costs $166
You want to find {{{x}}} when {{{c(x) < 75x}}}
Note that $75 is cost per pump, and {{{75x}}} is 
the cost for {{{x}}} pumps
What about {{{c(x) = 75x}}}?
{{{c(x) = x^2 - 22x + 166}}}
{{{75x = x^2 - 22x + 166}}}
{{{x^2 - 98x + 166 = 0}}}
Solve using quadratic formula
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
{{{a = 1}}}
{{{b = -98}}}
{{{c = 166}}}
I can't finish- Have to run
but that's the start