Final Answer
the value that represents the change in the amount of blocks left after completing a row is 9.
Step-by-step explanation:
To find the value that represents the change in the amount of blocks left after completing a row, we need to divide the total number of blocks by the number of rows. In this case, Allen has 45 concrete blocks and he wants to build 5 rows of a wall. To find the number of blocks in each row, we divide the total number of blocks by the number of rows: 45 blocks ÷ 5 rows = 9 blocks per row.