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Olegator [25]
3 years ago
9

PLEASE HELP!!!what is the explicit formula for the sequence7 2 -3 -8 -13

Mathematics
2 answers:
Mariulka [41]3 years ago
7 0

Assuming the index start from 1, i.e. the first element is a_1, the answer is the last one: a_n = -5n+12


In fact, the elements of the sequence differ by 5 units from each other, and are descending, which justify the -5n part.


Nevertheless, the sequence starts from 7, so when n=1 we must have


-5+k=7 \iff k=12


hence the formula


a_n = -5n+12

Goryan [66]3 years ago
5 0
It is D.

When you plug in the step number instead of "n" you need to get "a" for your answer.
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