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Write a formula for the nth term of the arithmetic sequence 1, 5, 9, 13, ……. then use the formula to find f(20).
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Write a formula for the nth term of the arithmetic sequence 1, 5, 9, 13, ……. then use the formula to find f(20).

User Daxgirl
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1 Answer

4 votes
1+4(n-1)=f(n)
f(20)=77
User El Mac
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