25% of 28,000 is 7,000.
If the unit depreciated by 7,000, it is now worth 21,000.
B the number of people is quantity or quantitative
You have to divide the fractions by the numbers
The given expression is:

There are 3 terms in this expressions:
1)

2)

3) 2
The coefficient of

is 3.
The coefficient of

is -7.
The constant term is 2.