This activity is based off of [url=https://www.geogebra.org/m/RCVce5W4]this one[/url] by [url=https://www.geogebra.org/u/j+mulholland]J Mulholland[/url]. The conceptual structure is exaclty what I needed. I just reformatted it to fit my teaching style and course. Thank you JM