Self-tutoring about gardening: the tutor observes the renewal rate of black-eyed susan blooms in one plot. Since perhaps late June, I’ve been deadheading a plot of black-eyed susans. I’d say I do so about twice per week, and always clip …
Gardening, math: black-eyed susans: renewal rate Read more →
Tutoring math, logarithms come up. The tutor mentions a way to see the exponent-to-multiple rule. The following is by my understanding. With logarithms – aka, logs – the log of a power can be made into a multiple of the …
Tutoring math, polynomial structures arise. The tutor mentions using the conjugate. The following is by my understanding. Let’s imagine one is asked to simplify the following: (x+3)(x-1)(x-3)(x+1) If one does so in the order it’s presented, it gets a bit …
Tutoring math, the idea of a conjugate arises. The tutor mentions it. The following is by my understanding. In high school math, the conjugate refers to a binomial construction that, when multiplied by its own conjugate, yields no “middle terms.” …
Tutoring university level math, one might run into complex numbers. The tutor begins about them. The following is by my understanding. In the Real number system, there is no square root of -1. Yet, in the Complex number system, sqrt(-1) …
Tutoring math, quadratic functions come up. The tutor mentions the quadratic formula. The following is by my understanding. The quadratic formula assumes the equation is in the form ax^2 + bx + c = 0. Then, the roots, aka answers, …
Tutoring math, the Richter scale comes up. The tutor gives some quick ideas about it. The following is by my understanding. The Richter scale is logarithmic, meaning non-linear. In fact, every whole-number increase in it means 10x stronger. So, a …
Tutoring math, the fraction button can offer workarounds. The tutor mentions how to reduce fractions on the Casio fx-260Solar Fraction and Casio fx-260Solar II models. The following is according to my understanding. Reducing a fraction means putting it in lowest …
Tutoring math, one discovers idiosyncrasies of equations. The tutor mentions one about quadratics. The following is according to my understanding. Thumbing through an old textbook, I encountered the idea that, with a quadratic, its two roots (answers) add up to …
Math: quadratic equations: the sum of the roots formula Read more →
Tutoring math, problems might come up about the turns (rpm) of one gear relative to another. The tutor mentions an example. Question: Suppose Gear A (14 teeth) and Gear B (21 teeth) are enmeshed. If Gear B turns 60 rpm, …
Math: how fast does one gear turn, if the other gear turns at so-and-so rpm? Read more →