## Algebra 1: Common Core (15th Edition)

a) $A(n)=21+(n-1)2$ b) $A(n)=2+(n-1)7$
a) We have $A(1)=21$ $A(n)=A(n-1)+2$ $A(n)=A(1)+(n-1)d$ $A(n)=21+(n-1)2$ b) We have $A(1)=2$ $A(n)=A(n-1)+7$ $A(n)=A(1)+(n-1)d$ $A(n)=2+(n-1)7$