SSP MAA Sigma Notation

What is the name of this notation? $$\Sigma$$  

Expand $$\sum_{r=1}^{10}2r$$   

$$\sum_{r=3}^{20}\left(2r+1\right)$$  is a/an (a)   series.

State the number of terms in $$\sum_{r=1}^{11}f\left(r\right)$$  

(a)  

State the number of terms in $$\sum_{r=-2}^{11}g\left(r\right)$$  

(a)  

Find the value of $$\sum_{r=1}^{15}\left(3\right)$$  

(a)  

Find the value of $$\sum_{r=1}^{15}\left(-1\right)^{\left(r+1\right)}$$  

(a)  

True or False? $$\sum_{r=0}^nr=\sum_{r=1}^nr$$  

True or False? $$\sum_{r=1}^n\left(kr+a\right)=k\sum_{r=1}^nr+a$$  

Find the value of $$\sum_{r=5}^{27}\left(\frac{2}{5}r+1\right)$$  

(a)