Question

Find the general term and write the following with sigma notation:
1+2+4+8.... to 9th term

Answer 1

Answer:

to go to of of if you want to talk to

Step-by-step explanation:

so I am not sure how to get it

Answer 2

$\huge\boxed{\fcolorbox{white}{pink}{Answer}}$

The sequence starts at 1 and doubles each time, so

a=1 (the first term)

r=2 (the "common ratio" between terms is a doubling)

And we get:

{a, ar, ar2, ar3, ... }

= {1, 1×2, 1×22, 1×23, ... }

= {1, 2, 4, 8, ... }

$\Large\boxed{.xn =ar^(n-1)}$

(We use "n-1" because ar0 is for the 1st term)