In 2010, the United States national debt was estimated to be nearly 13,000,000,000,000 dollars. Which of the following represents the national debt in scientific notation?
A1.3 x 10^11
B1.3 x 10^12
C1.3 x 10^13
D1.3 x 10^14 ...?
A1.3 x 10^11
B1.3 x 10^12
C1.3 x 10^13
D1.3 x 10^14 ...?