Emma bought 16 packages of rolls for a party.there were 12 rolls in a package. After the party there were 8 roll left over. How
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well, the recursive rule of aₙ = aₙ₊₁ + 7, where a₁ = 15, is simply saying that
we start of at 15, and the next term is obtained by simply adding 7, and so on.
well, that's the recursive rule.
so then let's use that common difference and first term for the explicit rule.