The following table includes the prices over the last six months for a material that you purchase. May Jun Jul Aug Sep Oct $25.10 $25.71 $26.00 $26.55 $27.26 $27.58 Are the prices a.) increasing or b.) decreasing over time on average? (input a or b) What is the linear forecast for the future month of December? Round to the nearest cent (2 decimal places and do not include $) What is the forecasted average change in price per month? Round to the nearest cent (2 decimal places and do not include $)