## Calculator usage: percentage markups and selling price with the Staples BD-6120G

The tutor covers a couple of fun features of the Staples BD-6120G. The Staples BD-6120G is a scientific calculator, but it’s got some neat features useful to buyers and sellers as well. In particular, it’s got some very handy percentage …

## Housekeeping: cleaning vacuum filters

The tutor offers commentary on a job he doesn’t do often enough. In my household, I own some housecleaning chores, one being vacuuming. It’s really not much work, but like everything else, it’s got its details, one of which is …

## Math: a quadratic word problem

For academic math 11 students, this is standard fare. The tutor shows a way to approach it. Consider the following problem: Two numbers sum to 20. What is the minimum sum of their squares? Solution: Of course we start with …

## Chess: playing the computer

The tutor gives some commentary on playing computer chess. I mainly play computer chess – always as Black. The engines I play against have tendencies that I guess are typical: they are materialistic and they like passed pawns. (A passed …

## Life: strengths and weaknesses.

The tutor reflects on an age-old dilemma. My wife is a great cook. Around running the kids to their activities, she still cooks a full dinner almost every evening. She likes cooking and she’s talented at it. I know my …

## Javascript: an HTML color checker

The tutor offers a little utility that connects the user with HTML color. In web coding, one way HTML colors are indicated is as follows: style=”color:#ff0000″ More specifically, the color string is of the form #rrggbb. After the hash tag, …

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## Biology: winter survival

The tutor shares a fact that surprises him. Winter here is fairly mild; I think the mean daily temp in Jan might be around 5 deg Celsius, with the mean nightly low being around -1 deg Celsius. That being said, …

## Calculator use: entering fractions with the Sharp WriteView

The tutor brings up a small issue that can be tricky for new WriteView users. The WriteView I have is the Sharp EL-W535. Of course, a feature of the WriteView is that it shows fractions up-and-down, just like a person …

## Perl: qw (quote words)

The tutor brings up a neat Perl utility that you often see used in discussions between programmers. There are many articles on this site about arrays. To a newcomer, one that might be helpful is here. The point of today’s …

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