Answer: It would be dug 9 feet deep hole in the ground.
Step-by-step explanation:
Since we have given that
On the first day , they dug a hole of length = 3 feet
On the second day, they dug a hole of length = 2 feet
On the third day , they dug a hole of length = 4 feet
Since all the above integers are negative integers as they are length beneath the ground.
So, Sum of negative numbers would be
[tex]-3-2-4[/tex]
And the total sum would be
[tex]-3-2-4=-9\ feet[/tex]
Hence, it would be dug 9 feet deep hole in the ground.