Is it possible that the image of a point after a reflection could be the same point as the preimage? explain

Yes it is possible if the point is on the line of reflection. For example, if the point (2,0) is reflected over the x axis, then it will stay on the x axis and stay at the location (2,0). 

Certainly.

Every point on the line of reflection is invariant--it maps to itself.

D) the x-intercept represents adam's commission pay when he had zero total sales