The table shown below gives the approximate number of pieces of mail handled by the United States Postal
Service for different years.
How many more pieces of mail were handled by the United States Postal Service in 1995 than in 1965?
Express your answer in scientific notation.
Year Approximate number of pieces of mail handled
1950
4.5. 1010
1965
7.2.1010
1980
1.0.1011
1995
1.8 - 1011
2010
1.7. 1011
pieces of mail