 In this problem we're converting decimal notation to scientific notation. So in order to do this you're going to find where the decimal point would be in these numbers and in all of them it's after the last zero. Those zeros are not significant though so you want to remember that when you're writing it in scientific notation. In scientific notation you're only going to write the significant digits. So if you look at A we're going to take that decimal and move it in between the three and the seven. You're always going to want to put it after that first digit. So the number of spaces we moved it is one, two, three, four, five, six, seven. So that's where that ten to the seventh comes from. And of course we see there's three, seven, six, nine, two. So in our number we're going to put three point seven, six, nine, two times ten to the seventh. So we're going to do that same sort of analysis on all of these. So for the next one 1,360,000 that's going to become 1.36 times ten to the sixth. The next population, 19,306,000 is going to become 1.9306 times ten to the seventh. And then the final population, the one of Wyoming, 568,000 is going to be converted to scientific notation as 5.68 times ten to the fifth. So I think usually the thing that people, introductory chemistry students get incorrect when doing these is to remember that those zeros are not significant. Okay? Let me know if there are any questions.