Need some help with these 4 financial accounting problems. Please explain the following calculations after completing the problems.

12-9a	Show the supporting calculations used to arrive at the dollar amount entered for the net increase in cash.
12-10a	Show supporting calculations for the dollar amounts entered online for the cash received from customers, payments to suppliers, and cash payments for operating expenses.
13-2a	Show the supporting calculations for the ratios entered forparts (a) - (n).