A company selling widgets has found that the number of items sold a depends upon the price p at which 90000 they're sold, according the equation x = 4p+1 Due to inflation and increasing health benefit costs, the company has been increasing the price by $5 per month. Find the rate at which revenue is changing when the company is selling widgets at $140 each. dollars per month Find the rate of change of total profit, dollars, with respect to time where R(x) = 70x 0.5x and dx C(x)=50x+9, when x = = 19 and = 30. dt dollars per day The demand function for a product is given by p(n) = 490 - 0.15m, where p is the price in dollars and n is the quantity in thousands. If adverse weather conditions are driving the price up by $7 per week, find the rate at which the demand quantity for the product is changing when the price is $430. The demand for this product is falling per week. by thousand items