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Topic 1: Number and algebra 19. The fourth, tenth and thirteenth terms of a geometric sequence form an arithmetic sequence. Given that the geometric sequence has a sum to infinity, find its common ratio correct to three significant figures. (You will need your GDC)

Topic 1: Number and algebra 19. The fourth, tenth and thirteenth terms of a geometric sequence form an arithmetic sequence. Given that the geometric sequence has a sum to infinity, find its common ratio correct to three significant figures. (You will need your GDC)

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Could u help with 19 and 20? Thank u sooooo muc.
Topic 1: Number and algebra 19. The fourth, tenth and thirteenth terms of a geometric sequence form an arithmetic sequence. Given that the geometric sequence has a sum to infinity, find its common ratio correct to three significant figures. (You will need your GDC) 14 20. Andrea and Breanne each open a savings account. Andrea deposits $80 in the first month and then increases her deposits by $10 each month. Breanne deposits $40 in the first month and then increases her deposits by 5% each month. After how many months will Breanne have more money in her account than Andrea? (You will need your GDC-hint: use 2nd Table to see the values to find appropriate Window settings) Page 10 of 12
Transcribed Image Text:Topic 1: Number and algebra 19. The fourth, tenth and thirteenth terms of a geometric sequence form an arithmetic sequence. Given that the geometric sequence has a sum to infinity, find its common ratio correct to three significant figures. (You will need your GDC) 14 20. Andrea and Breanne each open a savings account. Andrea deposits $80 in the first month and then increases her deposits by $10 each month. Breanne deposits $40 in the first month and then increases her deposits by 5% each month. After how many months will Breanne have more money in her account than Andrea? (You will need your GDC-hint: use 2nd Table to see the values to find appropriate Window settings) Page 10 of 12
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