SOLUTION: 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 arithmet

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.
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46,42,38,34,.... etc
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aritmetic:
a(1) = 46
common difference: -4
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a(12) = a(1)+(n-1)d
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a(12) = 46 + (11)(-4)
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a(12) = 2 bricks
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Cheers,
Stan H.
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