Dwayne’s company constructs and paints billboards. The billboards vary in size, but they always are rectangular and have a length that is twice the width. Dwayne determines the cost of paint per can and creates a graph showing the price to paint a billboard, given the billboard’s length. image 3f0c5d4abf214610b99fb249b893c916 What is the average rate of change in the price to paint a billboard when the length of the billboard increases from 10 feet to 20 feet?