I got the answer by adding the triangles
The population in 2040 of the town can be solved using the formula
F = P( 1 -I)^n
Where F is the future population
P is the present population
I is the decline rate
N is the number of years
F = 22,000(1-0.028)^39
<span>F = 7268</span>
4x40= 160
6x40= 240
160/12= 13.33
240/12= 20
13.33x20= 266.6
The answer is 266.6 square feet