Find a formula for $a$, for the arithmetic sequence. $$a_{1}=-4, a_{5}=16$$
Added by Benjamin E.
Step 1
We know that an arithmetic sequence has a common difference, $d$, between consecutive terms. So we can write the terms as follows: $$a_1 = -4$$ $$a_2 = -4 + d$$ $$a_3 = -4 + 2d$$ $$a_4 = -4 + 3d$$ $$a_5 = -4 + 4d$$ Show more…
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