Question

Alberto is stacking firewood. He puts 20 logs on the bottom row. Then he stacks each row so that there is 1 fewer log than the row below. Which of the following is formed by the number of logs in 10 rows?

A. an arithmetic series
B. an arithmetic sequence
C. a geometric series
D. a geometric sequence

Answer 1

Ansewer is a

Explanation:

Answer 2

This would be A) an arithmetic series.

The number of logs in each row would give an arithmetic sequence, as it decreases by 1 each time.
Finding the total number of logs in 10 rows would be finding the sum, which makes it an arithmetic series.