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According to the United States Treasury Department, the U.S national debt was 1.815 x 10 to the 13th power dollars on September 30, 2015 . On September 29, 2005 , the national debt was 4.974 x 10 to the power of 12 dollars . Find the amount of Increase in the national debt from September of 2005 to september of 2015? Write a sentence describing the increase in the national debt from 2005 to 2015 using scientific notation and using standard form.

Respuesta :

The U.S national debt on 2015 was 1.815 * 10^13

The U.S national debt on 2005 was 4.974 * 10^12

So, the amount of increase =

1.815 * 10^13 - 4.974 * 10^12 =

18.15 * 10^12 - 4.974 * 10^12 =

(18.15 - 4.974) * 10^12 = 13.176 * 10^12

= 1.3176 * 10 * 10^12 = 1.3176 * 10^13

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