Question

Give the first four terms of a geometric sequence having a1=18 and r = 2.

Answer 1

Hello,


`a_(1)=9*2=18`

`a_(2)=9*2^(2)=36`

`a_(3)=9*2^(3)=72`

`a_(4)=9*2^(4)=144`


`a_(n)=9*2^(n)`