The graph below shows changes in the earth's average surface temperature since 1880.
global temperature anomalies (°c)
degrees
-06 + + + + + + +
year 1880 1900 1920 1940 1960 1980 2000
-= yearly average - = five year average
if the earth's average surface temperature continues to change over the next 30 years at the same rate it cha
1980 and 2010, the average temperature will most likely be around

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill