Okay. I can answer your first part. Click this image for the first part. https://docs.google.com/document/d/10T54huuiYA8vSYyZIZ7bGS9lgkJftdlgbdL5KzSoJkQ/edit
The answer would be <span>99.99999989.</span>
Oh. It's rounding. So, for example, depending what you were told to round to, the second problem would be 760-330=430