## Geometry: Common Core (15th Edition)

Solve the given equation for $m\angle A$. $2(m\angle A)+17=45\longrightarrow$ subtract 17 from each side $2(m\angle A)=28\longrightarrow$ divide each side by 2 $m\angle A=14$ Substitute to find $m\angle B$. $m\angle B=2(m\angle A)=2(14)=28$