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oksian1 [2.3K]
4 years ago
6

What is the explicit formula for arithmetic sequence {-20, -5, 10, ...}? Use f(n) where is 1, 2, 3, and so on.

Mathematics
1 answer:
vekshin14 years ago
5 0
Answer: B

Work:
Since the general formula of an arithmetic sequence is f(n) = (the first term) + (common difference)*(n-1), you just plug in what was given to you in the problem to that equation. The first term is -20 and the common difference is +15 since the the increase from one term to the next is 15. Doing so produces the equation f(n) = -20 + 15(n-1), which is choice B.
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