20 points ! vance sells between 300 and 310 items at a convention. he pays a one time $450 fee, and earns $15 commission for each item that he sells. the function p(i)=15i−450p represents vance's convention earnings as a function of items sold. what is the practical domain of the function? 300≤i all integers between 300 and 310 inclusive [300,  310] all real numbers