Thursday

August 21, 2014

August 21, 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

**Related Questions**

Math - A pile of bricks has 85 bricks in the bottom row, 81 bricks in the second...

math - bricks are stacked in 20 rows such that each row has a fixed number of ...

Math - Mike bought 252 bricks to build a wall in his yard. Each row has 14 ...

Math - Julia wants to build another garden wall, 10 bricks long and 3 bricks ...

Advanced Math - Find DE if matrix D= Row 1= -2,4,6 and ROW 2= 5,-7,1 and matrix ...

maths - A brick wall is built by using 2 bricks less in each layer than in the ...

Math - A patio was to be laid in a design with one tile in the first row,two ...

Math - What would be the second number in row 23? Row 0= 1 Row 1= 1 1 Row 2= 1 2...

math - If you have 30 white lego bricks, 42 red lego bricks, and 45 black lego ...

Algebra - A brick staircase has a total of 16 steps The bottom step requires 112...