To find out how much clay the potter needs to buy for 848 dinner plates, you can multiply the amount of clay needed for one plate by the total number of plates.
The amount of clay for one dinner plate is 4 pounds.
So, for 848 plates:
\[ \text{Total clay} = 4 \text{ pounds/plate} \times 848 \text{ plates} = 3392 \text{ pounds} \]
The potter should buy 3392 pounds of clay.