To find the relationship between the number of stitches and the length of the row, we can observe the values given in the table:
- For 1 cm length: 7 stitches
- For 3 cm length: 21 stitches
- For 4 cm length: 28 stitches
- For 6 cm length: 42 stitches
Now, let's analyze the data:
- For 1 cm: 7 stitches
- For 3 cm: 21 stitches (7 × 3 = 21)
- For 4 cm: 28 stitches (7 × 4 = 28)
- For 6 cm: 42 stitches (7 × 6 = 42)
From these calculations, we can see that the number of stitches is consistently 7 times the length in centimeters.
Therefore, the correct response is: The number of stitches is 7 times the length.