SOLUTION: write a rulefor the nth termof the arithmetic sequence.. problem #1...a11=29;a20=101 that is a 11 problem #2 a6=-31;a14=-135 Thank you

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Question 613013: write a rulefor the nth termof the arithmetic sequence..
problem #1...a11=29;a20=101
that is a 11
problem #2 a6=-31;a14=-135

Thank you


Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 
Hi,
a%5B20%5D=+101+=+a%5B1%5D%2B%2819%29%2Ad
a%5B11%5D=+29+=++a%5B1%5D%2B%2810%29%2Ad
72 = 9d
8 = d
29+=+a%5B1%5D+%2B+80
-51+=+a%5B1%5D
a%5Bn%5D=+-51+%2B%28n-1%29%2A8
OR
a%5Bn%5D=+8n-59