Function notations

Problem:



Solution:

Part b)

We have $ 1945 - 1950 = -5 $, therefore, the answer is $ w(-5) $.

Part c)

We have $ 1982 - 1950 = 32 $, therefore the average number of acres per farm in 1982 is w(32)
We have $ 1930 - 1950 = -20 $, therefore the average number of acres per farm in 1930 is w(-20)

The change (i.e. answer) is $ w(32) - w(-20) $.