Answer:
42 inches
Step-by-step explanation:
Im guessing that the the table looks like this:
Width Length
3 7
6 14
9 21
So we can see the numbers on the right are increasing by 3 and the numbers on the left are increasing by 7.
The width is 3 times some number, and the length is 7 times the same number.
So if the width was 18 then we know the number would be 3 because 3 * 6 = 18
If that number is 6, then the length will be 6 * 7 = 42
So the length is 42 inches
