Answer:
Currently, Randy has 3 rows of carrots with 3 plants in each row, which gives a total of 3 * 3 = 9 plants.
Next year, Randy plans to plant 4 times the number of rows. Therefore, he will have 4 * 3 = 12 rows of carrots.
If each row still has 3 plants, then next year Randy will have a total of 12 * 3 = 36 plants.