# Post 133: March 14th, 2017

First order of business today was Algebra. I learned about direct, joint, and inverse variation. Kind of interesting stuff, here’s a summary;

A direct variation can be expressed in the form y=kx, where the k is a constant, called the constant of variation. Y varies directly as x if there is some nonzero constant k, such that y=kx.

Joint and inverse variation are similar. In joint variation, y varies jointly as x and z if there is some number k such that y=kxz, where k, x, and z are not 0. For inverse variation, y varies inversely as x if there is some nonzero constant k such that xy = k, or y = k/x.

Next up, Sociology. I learned about groupthink, which is basically the principle that in a group, people tend to present themselves as thinking alike with the rest of the group, in order to avoid conflict. It can have really bad consequences, like the widespread belief that the United States could never be attacked at Pearl Harbor.

Finally, Programming. I learned about Zigbee. It’s a technical standard for wireless communication, mainly used for small scale projects. Fun fact, the name is actually based on the waggle dances of honey bees. I just find that interesting.

## Author: Carl Hall

Brick and mortar school, cyber school, and now home school