Final answer:
The student's question regarding the values of Px and Ex does not provide sufficient context or relevant equations to answer accurately, as the information given pertains to different physics concepts and not to the signal in question. More specific details or a clarified question are necessary.
Step-by-step explanation:
The question seems to involve calculating certain parameters (Px and Ex) for given signals and systems, particularly in the field of Physics or Electrical Engineering, rather than the provided context of quantum state populations and equilibrium constants, which do not directly apply to the initial signal of xi(t) = e−2tu(t)
The student's question appears to be asking for the power (Px) and energy (Ex) of a signal xi(t). To find these values, one would typically square the signal and integrate over a relevant interval to get the power, and integrate the absolute squared signal over all time for the energy, assuming that xi(t) is an energy signal (which seems likely given its exponential decay). Unfortunately, without the proper context or expressions related to xi(t), it is not possible to provide an accurate response. A more specific question or additional information would be required to solve for Px and Ex.