the geometric sequence , algebra homework help

the geometric sequence , algebra homework help

If S6 = 189 and r = 2, what is a1?

9

6

3

3/2

If S8 = 1530 and r = 2, what is a1?

3

6

9

1

Find three geometric means between 9 and 144.

42.75, 76.5, 110.25

2304, 36864, 589824

18, 36, 72

27, 81, 243

Find the 15th term in the geometric sequence shown below.

1, 3, 9,…

4782969

14348907

43

1594323

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