Using U.S. Department of Energy data from 2010 and projected to 2032, the millions of metric tons of carbon dioxide emissions from biomass energy combustion, y, in the United States can be modeled by

y = -0.022x³ + 0.86x² + 9.9x + 340

where x is the number of years past 2010.

(a) Graph this function for values of x that represent the years from 2010 to 2035.

(b) Does the graph in part (a) show that carbon dioxide emissions increase or decrease over this time period?

(c) Use the equation to find the change in carbon dioxide emissions from 2010 to 2011 and from 2029 to 2030.