May I please get some help

9 An accessories company nds that the revenue, in dollars, from the sale of x belts is given by R(x)= 65x1o . Find the rate at which average revenue is changing when 175 belts have been produced and sold. m 5 First, nd the rate at which the average revenue is changing when x belts have been produced. I(x)=D v ' When 175 belts have been produced and sold, the average revenue is changing at D :1 for each additional belt. (Round to four decimal places as needed.)