This text was written by Hazel McKenna and Leo Chang of Utah Valley University as an Open Educational Resource (OER), with a few sections pulled from previously written Lumen material.

The corresponding OHM homework was developed by Roxanne Brinkerhoff of Utah Valley University.

Special thanks to John Jarvis of Utah Valley University for editorial review of both the homework and text.

The copyright for this text is CC by attribution, 2022.