On April 20th, 2010, an explosion and fire on an oil rig operated by British Petroleum (BP) caused the worst oil spill in history. On May 20th, the Associated Press reported, “oil has been pouring into the Gulf from a blown-out undersea well at a rate of at least 210 ,000 gallons per day.” Unfortunately, this turned out to be a best-case estimate. On June 20th, 2010, Associated Press reported that a confidential memo by BP gave a worst-case estimate of 4.2 million gallons per day pouring into the ocean.

a. What is the difference in gallons per day between the worst- and best-case scenarios? Use scientific notation to express your answer.
the scientfic notation I got was 4.2*10^6 so I would use that to express the difference and put it over 2.1*10^5, but then I'm stuck. Help.

1 answer

You just subtract them to get 3.99*10^6