## Math: ideas about infinity: how an infinite series can have a finite sum

Tutoring math, you realize that infinite series can be hard to visualize. The tutor offers perspective. An infinite series is a sum of terms that never end. An example is a repeating decimal, such as 0.2222222….., which means 0.2222222…. = …

Tagged with:

## Lifestyle: the origin of “tin foil hat”

Tutoring, the origins of common phrases can make fun topics. The tutor shares the origin of “tin foil hat”. A couple of years back, someone described a conspiracy theorist to me as “a tin-foil-hat guy…when he’s not dead right.” I …

Tagged with:

## Math: what discount will exactly cancel the tax?

Tutoring high school math, you see financial word problems. The tutor gives an example. Problem: At 12% tax, what discount will lead to paying exactly the sticker price after tax? Solution The final price, f, is as follows: f = …

Tagged with:

## Math: how far away is the goose?

Tutoring math, you notice that people like relatable examples. The tutor brings up his observation of a Canada goose. Looking out over a lake in Nanaimo on Sunday morning, I saw an exceptional Canada goose swimming apart from the others. …

## School supplies: mechanical pencils vs wooden ones

Tutoring math, you see the pencils students use. The tutor makes some observations. I’m a fan of mechanical pencils: You needn’t sharpen them. One will last for weeks, months, or even longer, depending on usage. You can retract the lead …

## Business: what do Carly Fiorina and Martha Stewart have in common?

Tutoring, you’re interested in education. The tutor brings up two business titans from the late ’90s/2000s: What were their first degrees? In their time, I followed both Carly Fiorina (CEO, Hewlett-Packard, 1999-2005) and Martha Stewart through the headlines. Both were …

Tagged with: ,

## Math: Excel: entering complex numbers

Tutoring differential equations or complex variables, you might use a spreadsheet sometimes. The tutor gives a hint about entering complex numbers on Excel. Excel does, indeed, handle complex numbers. Formulas for them are among the Engineering ones. Apparently, to enter …

Tagged with: