Answer:
The rejected by the air conditioning system is 1.75 kilowatts.
Explanation:
A air conditioning system is a refrigeration cycle, whose receives heat from cold reservoir with the help of power input before releasing it to hot reservoir. The First Law of Thermodynamics describes the model:

Where:
- Heat rate from cold reservoir, measured in kilowatts.
- Heat rate liberated to the hot reservoir, measured in kilowatts.
- Power input, measured in kilowatts.
The heat rejected is now cleared:

If
and
, then:


The rejected by the air conditioning system is 1.75 kilowatts.