(Solved): The following table shows worldwide sales of cell phones by a certain company and their average wh ...

The following table shows worldwide sales of cell phones by a certain company and their average wholesale prices in the first quarters of 2009 and 2010. (a) Use the data to obtain a linear demand function for the company's cell phones. (Let $$p$$ be the price, and let $$q$$ be the demand). $$q(p)=[$$ Use your demand equation to predict sales if the company lowered the price further to $$\$80$$. million phones (b) Fill in the blank. For every $$\$1$$ increase in price, sales of cell phones decrease by million units.