Question

Determine whether the problem should be solved using the formula for an arithmetic sequence, arithmetic series, geometric sequence, or geometric series. Explain your answer in complete sentences. You do not need to solve.
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?

Answer 1

We move up, row by row, subtracting 4 bricks as we go up each row.
In other words, we're adding -4 bricks as we go up each row.
With a geometric sequence, we multiply by the same factor with each successive term.
With an arithmetic sequence, we add by the same factor with each successive term.
A series is just the sum of a sequence up to a certain number in the sequence.
That should be enough info to answer the question.

Answer 2

Thank You So Much!!