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22. For the sequence 3, 10, 17, 24, ... , write the explicit equation for this sequence, then

find the 18th term.

User Didito
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1 Answer

4 votes

Answer:

see explanation

Explanation:

Note the common difference d between consecutive terms

d = 10 - 3 = 17 - 10 = 24 - 17 = 7

This means the sequence is arithmetic with n th term


a_(n) = a₁ + (n - 1)d

Here a₁ = 3 and d = 7, thus explicit formula is


a_(n) = 3 + 7(n - 1) = 3 + 7n - 7 = 7n - 4, thus


a_(18) = (7 × 18) - 4 = 126 - 4 = 122

User Trudyann
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