Question 1159510
Revenue= 123*$4
for pie sale of $3.50 per pie, she can sell 143
so for sale price of $4-(0.50x) the number of pies is 123+20x
that product is the revenue or 492+80x-61.5x-10x^2
so the quadratic is revenue(x)= -10x^2+18.5x+492

{{{graph(300,300,-5,5,-25,500,(4-0.5x)(123+20x))}}}