Joslyn wants to buy 4 packs of pens for $12.00 each and a pack of pencils for &6.00. How much money does she need
1 answer:
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The underlying arithmetic progression is
-15, 0, 15, 30, ...
starting with and with a common difference of
between terms. Recursively, this sequence is given by
So we have
and so on, so that the explicit rule for the sequence is
for .
The series consists of 15 terms, since
So we have
and the answer would be B.