Question 746463: A fireplace contains 46 bricks along its bottom row. If each row above decreases by 4 bricks, how many bricks are on the 12th row?
Determine if this is an geometric or arithmetic series or geometric or arithmetic sequence.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! A fireplace contains 46 bricks along its bottom row. If each row above decreases by 4 bricks, how many bricks are on the 12th row?
Determine if this is an geometric or arithmetic series or geometric or arithmetic sequence.
-----
46,42,38,34,.... etc
---
aritmetic:
a(1) = 46
common difference: -4
------
a(12) = a(1)+(n-1)d
-----
a(12) = 46 + (11)(-4)
-----
a(12) = 2 bricks
========================
Cheers,
Stan H.
========================
|
|
|
