AmySaunders wrote:What do you mean by a sales volume equation? Or a revenue equation? I have never heard of either of them.
I mean this part:
Write an equation which expresses the number of frankfurters sold as a function of price p in cents. What is the total revenue received from the sale of frankfurters per week if the price of each frankfurter is p?
They ask for an equation for the number sold and then ask for the total revenue in terms of "p", which means another equation (or expression), rather than a numerical value.
If you've never dealt with equations before, then I'm afraid you need more help than can here be provided.