The tutor tells how to change the batteries for the Sharp el-520w, el-531w, and el-w535. Here are the cell requirements: el-520w: two LR44 cells el-531w: two LR44 cells el-w535: one LR44 cell Flipping any of the three models over, you’ll …

Calculators: changing the cells for the Sharp el-520w, el-531w, el-w535 Read more »

The tutor tells how to set a border around a selected area in Excel. Here’s how: Select the area around which you want a border, then right click. You’ll see a toolbar and a menu. On the toolbar, find the …

Spreadsheets: How to border a range of cells in Excel Read more »

The tutor translates p→q to the boolean expression ¬A or B. In my beginning post about symbolic logic, I mention that the statement p implies q, also stated p→q, has the following truth table: p q p→q 0 0 1 …

Math: symbolic logic meets digital circuits: p→q means ¬A or B Read more »

The tutor shows an example of how to use the yearfrac() function in Excel or LibreOffice Calc. Example: Find the fraction of a year between January 10, 2016, and June 2, 2016. Solution: In Excel or LibreOffice Calc, select a …

Spreadsheets: Calculating fraction of a year: yearfrac() function Read more »

The tutor tells how to find the number of a day in the year with Excel or LibreOffice Calc. Today, October 21, 2016, is the 295th day of 2016. How do I know? Here are two ways: Counting the days …

Spreadsheets: which day in the year is this? -Calculated with Excel or LibreOffice Calc Read more »