Posted by Katie on Monday, October 31, 2011 at 9:32pm.
You have an arithmetic sequence where
a = 85 , d = -6
12th row = 85 + 11(-6) = 19
row(n ) = a + (n-1)d
1 = 85 + (n-1)(-6)
1 = 85 - 6n + 6
6n = 90
n = 15
there are 15 rows
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