Online Course Discussion Forum

AMC10 MC II-A Algebra Lesson 9

 
 
Picture of Zeyin Wu
AMC10 MC II-A Algebra Lesson 9
by Zeyin Wu - Sunday, July 17, 2022, 7:03 AM
 

I don't quite understand practice question 9.18, to be specific the sigma notation. I need some help with that. Thanks!