US National Deficit: 17 trillion dollars
$17,000,000,000
1.7 * 10^10
10^4 = 10,000
15,000:standard notation
1.5 * 10^4:scientific notation
negative powers
1.5 * 10^-4 = 0.00015
3.2* 10^-5 = 0.000032
2,700,000,000 -> 2.7 * 10^9
convert to scientific notation
34,000,000 -> 3.4 * 10^7
