URGENT!!! Algebra: Using the given information, calculate the following sums. 15. Find S6 for the geometric series 80 + 40 + 20 + … 16. Find Sn when a, = 5, a, = 405, and r = 3. 17. Find Sn when a, = 7,

URGENT!!!

Algebra: Using the given information, calculate the following sums.

15. Find S6 for the geometric series 80 + 40 + 20 + …

16. Find Sn when a, = 5, a, = 405, and r = 3.

17. Find Sn when a, = 7, a, = 875, and r= 5.

18. Find S8 for the geometric series 1 + 2 + 4 + 8 + …

URGENT!!! Algebra: Using the given information, calculate the following sums. 15. Find-example-1

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URGENT!!! Algebra: Using the given information, calculate the following sums. 15. Find S6 for the geometric series 80 + 40 + 20 + … 16. Find Sn when a, = 5, a, = 405, and r = 3.…

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