2 years ago

The number of bricks on the bottom row was 21, and each row above it had 2 fewer

Mathematics

2 answers:

dlinn [17]2 years ago

7 0

Answer:

121

Step-by-step explanation:

21-2x

add all of the sums from 0 - 11

emmainna [20.7K]2 years ago

3 0

Answer: 121

Step-by-step explanation:

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