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The number of bricks on the bottom row was 21, and each row above it had 2 fewer bricks. If there were 11 rows in the stack of bricks, how many bricks were there altogether?

The number of bricks on the bottom row was 21, and each row above it had 2 fewer bricks. If there were 11 rows in the stack of bricks, how many bricks were there altogether?
asked 84.5k views
5 votes
The number of bricks on the bottom row was 21, and each row above it had 2 fewer

bricks. If there were 11 rows in the stack of bricks, how many bricks were there altogether?

asked
User Pankrat
by
8.3k points

2 Answers

4 votes

Answer:

121

Explanation:

21-2x

add all of the sums from 0 - 11

answered
User Lakerfield
by
8.1k points
4 votes

Answer: 121

Explanation:

answered
User Ejoubaud
by
9.0k points
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