SOLUTION: What would the algebraic expression be for these problems because i can't figure it out? 1. term number : 1 3 5 7 term value: 9 15 21 27 2. term number: 1 2 3 4

Question 836433: What would the algebraic expression be for these problems because i can't figure it out?
1. term number : 1 3 5 7
term value: 9 15 21 27
2. term number: 1 2 3 4 5 6 7 8
term value: 12 14 16 18 20 22 24 26
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
1) first term value is 9 and note that the differences for the given values is 6
this leads to an arithmetic progression where
the common difference between successive terms is 3 and we start with 9, therefore
a(n) = 9 + (n-1)*3 where * means multiply and n is the nth term
2) first term is 12 and note that successive differences for given values is 2
the common difference is 2 and first term value is 12, therefore
a(n) = 12 + (n-1)*2

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