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?

Respuesta :

Answer: 121

Step-by-step explanation:

Answer:

121

Step-by-step explanation:

21-2x

add all of the sums from 0 - 11

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