Question

2.What is the sum of the geometric sequence 4, 12, 36 … if there are 9 terms?

Answer 1

Recursively this should look like: A.(1)=4, A.(n+1)=3(An)

Answer 2

Honestly, how I do these, is put in your calculator 4 and hit "=", then hit the ANS x 3
and keep hitting equals and writing the numbers down until you get your 9 numbers, and then add them all up.
But they should be 4 12 36 108 324 972 2916 8748 26244, the addition of which = 39364

Answer 3

thanks