This is the example that I found with the information. I need help with locating the formula and why I am using these formula?

Theresa

  Bettendorm Corporation has a book net work of $17,800. The Company's long term debt is $6,900.00. Its net working capital excluding cash is $1,600. Its fixed assets are $21,300. How much cash does the company have? If the current liabilities are $2,575. What are the current assets.