If the first term in an arithmetic sequence is –3 and the tenth term is 15, what is the common difference? A. d = 2 B. d = 3 C. d = 6 D. d = 12

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If the first term in an arithmetic sequence is –3 and the tenth term is 15, 2 is the common difference. 10th term = -3 + (10 - 1)*d = 15 -3 + 9d = 15; 9d = 18; d = 18/9; d= 2

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Asked 5/23/2016 10:28:53 AM

Updated 5/24/2016 2:30:47 AM

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Venen

If the first term in an arithmetic sequence is –3 and the tenth term is 15, 2 is the common difference.
10th term = -3 + (10 - 1)*d = 15
-3 + 9d = 15;
9d = 18;
d = 18/9;
d= 2

Added 5/24/2016 2:30:47 AM

This answer has been confirmed as correct and helpful.

Confirmed by Andrew. [5/24/2016 6:40:28 AM]

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Confirmed by Andrew. [5/30/2016 1:53:27 AM]

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