Final answer:
The resultant force when Joe pushes the box with a force of 16 Newtons to the left and Ann pushes the box with a force of 8 Newtons to the right is 8 Newtons to the left.
Step-by-step explanation:
When two forces act on an object in opposite directions, we can find the resultant force by subtracting the smaller force from the larger force. In this case, Joe pushes the box with a force of 16 Newtons to the left and Ann pushes the box with a force of 8 Newtons to the right.
To find the resultant force, we subtract the smaller force from the larger force: 16 N - 8 N = 8 N.
Therefore, the resultant force is 8 Newtons to the left.