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July 23, 2014

July 23, 2014

Posted by **Katie** on Monday, October 31, 2011 at 9:32pm.

how many bricks are in the 12th row?

how many rows are there in all?

- MATH -
**Reiny**, Monday, October 31, 2011 at 9:52pmYou 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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