?
Jun 26, 2018 #2 jedishrfu Mentor Insights Author 13,688 7,686 This may answer your question mark https://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/observer.htm
This may answer your question mark https://www.grc.nasa.gov/WWW/k-12/Numbers/Math/Mathematical_Thinking/observer.htm