ANSWER EXPLANATION:: a. What sector is the least contributor to carbon dioxide emission? - Answer: The Commercial sector is the least contributor, with only 4% of the total CO2 emissions b. What sector has the same carbon dioxide emission as commercial and residential combined? - Answer: The Industrial sector has the same carbon dioxide emission as commercial and residential combined (4% + 9% = 13%) c. If the carbon emission in a year is 250,000 tons, how much is contributed by each sector (in tons)? Answer:- Transportation: 250,000 tons * 58% = 145,000 tons- Electric Power: 250,000 tons * 16% = 40,000 tons- Industrial: 250,000 tons * 13% = 32,500 tons- Residential: 250,000 tons * 9% = 22,500 tons- Commercial: 250,000 tons * 4% = 10,000 tons HOPE IT HELPS YOU BETTER