To determine the maximum area Eric can cover with the tiles, we first need to calculate the area of one tile.
Each tile has a side length of 6 inches. The area \( A \) of a square tile is given by the formula:
\[ A = \text{side} \times \text{side} \]
Substituting the side length:
\[ A = 6 , \text{in} \times 6 , \text{in} = 36 , \text{square inches} \]
Next, since Michael has 34 tiles, we can calculate the total area covered by all these tiles by multiplying the area of one tile by the number of tiles:
\[ \text{Total Area} = \text{Area of one tile} \times \text{Number of tiles} \]
Substituting in the values we have:
\[ \text{Total Area} = 36 , \text{square inches/tile} \times 34 , \text{tiles} = 1224 , \text{square inches} \]
Thus, the maximum number of square inches that Eric can cover with the tiles Michael has is
\[ \boxed{1224} \]