Exam review, 13-6

From the first thing we learned to the last thing we learned, its funny that the first and last are 2 of my favorites. I liked doing sigmas, it was easy and I like getting visual pictures of things.
A sigma is a series written in condensed form. There are all kinds of things you can do with sigmas but I like to keep it simple and find things in the sigma such as limits of summation, summand, and index.

Limits of Summation: the numbers in the sigma

Summand: is f(x) or y

index: is the variable

*Ill use Z as my sigma for now.

8
Z 5r
r= 1

Find the summand? 5r is the summand

What is the index?r

What are the limits of summation? 8 and 1

Evaluate the Sigma? 5+10+15+20+25+30+35+40=180; 5*1 + 5*2 + 5*3 + 5*4 + 5*5 + 5*6 + 5*7 + 5*8=180