Don has an album that holds 900 coins . Each page of the album holds 9 coins . If 78% of the album is empty, how many pages ar
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; a₁ is the first term, d is the difference between terms, and n is the term
-4, -21, -38, ... ⇒ a₁ = -4, d = -17
= -4 - 17n + 17
= 13 - 17n
= 13 - 1088
= 1075
Answer: 1075