 Okay, in the second of your two problems you're given these two numbers in the problem, thirty-eight miles per gallon, and the volume of gas that you've been able to use is seventy-six point five liters. So really all this problem is, it's two kind of little quirks to this problem. Of course you've got to know that you need that conversion factor from miles, or from liters to gallons, which I've given you there, one gallon is three point seven eight five liters. And then as you're going through the distance, what you're really just doing is converting that liters to miles. So how do you do that? You convert liters first to gallons and realize that the rating of the car is actually another conversion factor where you can convert miles to gallons. So you put the gallons on the bottom, it's just like how it's written there as it's given, and the miles on top, and that allows you to cancel out your gallons, giving you miles for your answer. And then if you look at your calculator, the number it gives you is essentially 768 miles. Well if I look at my two givens, one of them only has two sig figs. So I have to put this into two significant figures. So you could do that in one of two ways. You could write the scientific notation like I've done first, seven point seven times ten squared miles. But people like miles in nice little round numbers, so seven seventy miles, seems nicer to me just because I'm more familiar with that. And that number, seven seventy, only has two significant digits because there's no decimal point after that zero, so that zero is not significant. So remember your units and your sig figs and you should be set for this one.