the geometric sequence , algebra homework help

If S₆ = 189 and r = 2, what is a₁?

3/2

If S₈ = 1530 and r = 2, what is a₁?

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 15^th term in the geometric sequence shown below.

1, 3, 9,…

4782969

14348907

1594323

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