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What is the 23th term of the sequence {20, 16, 12.8, ... }
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What is the 23th term of the sequence
{20, 16, 12.8, ... }

User Nick Wyman
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1 Answer

6 votes

Explanation:


an = a1 + (n - 1)d \\ d = a2 - a1 \\ a1 = 20 \\ a2 = 16 \\ d = - 4 \\ an = 20 + (n - 1) * - 4 \\ an = 20 - 4n + 4 \\ an = 24 - 4n \\ a23 = 24 - 4 * 23 \\ a23 = - 68

User Eric Scrivner
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