Final answer:
Without specific equations of the curves, the areas of the regions divided by the line x=a cannot be determined, making the answer 'Impossible to determine'.
Step-by-step explanation:
The question asks about the area of regions created by a vertical line x=a dividing the space bounded by two curves in a coordinate plane. Although the specific equations of the curves are not given, we can infer that the areas of the two regions are equal by the premise of the statement. However, without the actual equations or functions that define these curves, it is impossible to determine a numerical value for the areas r1 and r2. The mere fact that x=a divides the region into two equal areas does not provide any information about the magnitude of those areas, making the answer to the student's question option (b) Impossible to determine without specific equations.