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To find the number of tiles that will not have a design on them, we first need to determine the total number of tiles.
Jack's dad is using 9 rows of tiles on one wall. Each row has 14 tiles. So, the total number of tiles on that wall is:
9 rows x 14 tiles per row = 126 tiles
Now, we need to subtract the 4 center tiles in the top 2 rows that have a special design.
In each of the top 2 rows, there are 4 tiles with a special design. So, the total number of tiles with a special design on them is:
2 rows x 4 tiles per row = 8 tiles
To find the number of tiles that do not have a design, subtract the number of tiles with a special design from the total number of tiles:
Total number of tiles - Number of tiles with a design = Number of tiles without a design
126 tiles - 8 tiles = 118 tiles
Therefore, there will be 118 tiles without a design on them.