Final answer:
The net force is 150 N to the left, as you subtract the smaller opposing force from the larger one to determine the net force and its direction.
Step-by-step explanation:
The question is asking for the net force and the direction of motion when two forces are applied in opposite directions. To find the net force, you subtract the smaller force from the larger force when they are acting in opposite directions. In this scenario, Davina applies a 350 N force to the left and Hector applies a 200 N force to the right. Therefore, the net force is 350 N - 200 N = 150 N to the left.