# Math Help - revenue function

1. ## revenue function

If p=450−45 q−q^2 is a demand equation, how fast is marginal revenue changing when 6 units of the product are demanded?

It is known that r= revenue = (price)*(quantity). Therefore, for the given demand equation the revenue function is r= ??

2. If $p=450-45q-q^2$ and $r=pq$, then

$r=(450-45q-q^2)\cdot q=450q-45q^2-q^3.$