Question

Number 7 what would all answers be

Answer 1

so... notice the picture below, that's P(x)

so
`\bf \qquad \qquad \textit{vertex of a parabola}\\ \quad \\ y = {{ a}}x^2{{ +b}}x{{ +c}}\qquad \left(-\cfrac{{{ b}}}{2{{ a}}}\quad ,\quad {{ c}}-\cfrac{{{ b}}^2}{4{{ a}}}\right)`

so.. when the quantity is
`\bf -\cfrac{{{ b}}}{2{{ a}}}` , is when the profit
`\bf {{ c}}-\cfrac{{{ b}}^2}{4{{ a}}}` is the highest

after that, as you can see from the graph, it goes back down