I can’t figure out which formula goes with which sequence. Help……. Please??? 1st sequence:
1,3,9,27,….
What is the formula?

2nd sequence:
400,200,100,50,…
What is the formula?

3rd sequence:
4,8,16,32,…
What is the formula?

4th sequence:
400,100,25,6.25,…
What is the formula?

5th sequence:
1,5,25,125,…
What is the formula?

6th sequence:
1000,500,250,125,…
What is the formula?

7th sequence:
2,10,50,250
What is the formula?

I need to know the correct geometric sequence formula for each of these sequences. Thanks!!!

For a geometric sequence

a, ar, ar ², ar ³, …

the n-th term in the sequence is ar ⁿ ⁻ ¹.

The first sequence is

1, 3, 9, 27, …

so it's clear that a = 1 and r = 3, and so the n-th term is 3ⁿ ⁻ ¹.

The second sequence is

400, 200, 100, 50, …

so of course a = 400, and you can easily solve for r :

200 = 400r   ==>   r = 200/400 = 1/2

Then the n-th term is 400 (1/2)ⁿ ⁻ ¹.

Similarly, the other sequences are given by

3rd: … 4 × 2ⁿ ⁻ ¹

4th: … 400 (1/4)ⁿ ⁻ ¹

5th: … 5ⁿ ⁻ ¹

6th: … 1000 (1/2)ⁿ ⁻ ¹

7th: … 2 × 5ⁿ ⁻ ¹

where is the rest of the

step-by-step explanation: