## Geometry: Common Core (15th Edition)

Add two to the first term to get the second. For each term, add 2 more than you added to the last term. $\underset{+2}{\underset\Rightarrow{1}}, \underset{+4}{\underset\Rightarrow{3}},\underset{+6}{\underset\Rightarrow{7}}, \underset{+8}{\underset\Rightarrow{13}},\underset{+10}{\underset\Rightarrow{21}}, \underset{+12}{\underset\Rightarrow{31}}, 43$, . . .