When you have kidney disease, your kidneys are no longer able to remove waste effectively from your body or to balance your fluids. The build up of wastes can change the chemistry of your body causing some symptoms that you can feel, and others that you don't.
Reference to a range of cells is typically of the form (A1:A6), which specifies all the cells in the range A1 through to A6. A formula such as =SUM(A1:A6) would add all the cells specified and put the result in the cell containing the formula itself.
Microsoft Excel automatically evaluates data and generates a value for a cell through programmed formulas under the Function tool. Formulas usually contain mathematical equations for calculations; the Excel Function tool inserts an analytical command in formula format. The symbol for less than or equal to (<=) can be used to set a specific criterion or comparative rule for evaluation.