# SOLUTION: Need rule for nth term - HELP!!! Okay 1/2,3,11/2,8,21/2.... what is the rule for the nth term d = -12 and a1 (1 is subscrpt) =80 - what is the rule for the nth term not sure

Algebra ->  Algebra  -> Sequences-and-series -> SOLUTION: Need rule for nth term - HELP!!! Okay 1/2,3,11/2,8,21/2.... what is the rule for the nth term d = -12 and a1 (1 is subscrpt) =80 - what is the rule for the nth term not sure       Log On

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 Algebra: Sequences of numbers, series and how to sum them Solvers Lessons Answers archive Quiz In Depth

 Click here to see ALL problems on Sequences-and-series Question 100069: Need rule for nth term - HELP!!! Okay 1/2,3,11/2,8,21/2.... what is the rule for the nth term d = -12 and a1 (1 is subscrpt) =80 - what is the rule for the nth term not sure of my answers Thanks Answer by Adam(64)   (Show Source): You can put this solution on YOUR website!1/2,3,11/2,8,21/2... Since most of the terms are in "halves". Good way how to start this problem is by coverting the integers in it into halves.It's generally good to have 1 type of numbers in pronlem either integers or fractions etc... So 3 = 3*2/2 and 8= 8*2/2 , thus 3 = 6/2 and 8 = 16/2 and we get 1/2 , 6/2 , 11/2 , 16/2 , 21/2 ...Easy to see that every numerator is increased by 5. It is arithmetic sequence. Formula for n-th term of arithmetic sequence is where d is increment you want to add each time. We can write : or Concerning your second problem I am quite sure you'll be able to finish it yourself. Good luck!