The Number of Millions of Short Tons of Carbon Monoxide

Multiple Choice

The number of millions of short tons of carbon monoxide emissions y in the United States can be described by , where x is the number of years past 1970 (Source: Environmental Protection Agency) . Use a graphing utility to plot this function and then use the graph to determine how many short tons of emissions occurred in 1990? ​

A) 177.57 million short tons
B) 341.86 million short tons
C) 126.54 million short tons
D) 250.66 million short tons
E) 149.86 million short tons