Question 1059622
-x^2+24x=80
-x^2+24x-80=0
x^2-24x+80=0
(x-20)(x-4)=0, x=4 and 20, at least 4 and no more than 20 ANSWER a.
x^2-24x-108=0 (want to be more than that) (x-18)(x-6)=0.
x=6, 18.  That is to be exactly 108, so the answer is between 7 and 17 inclusive ANSWER b.
Yes, with enough people, more than 24, the restaurant will lose money, ANSWER c.
x^2-24x=0, x(x-24)=0, and at 0 and 24, the restaurant will break even.
{{{graph(300,300,-10,30,-10,200,-x^2+24x)}}}