The formula of an area of a circle:

We have
r = 1.8 m
π ≈ 3.14
Substitute:

The inequality symbol in the picture stands for greater than or equal to, so 9, 11, 12 all apply in the equation
The side lengths are 2 units and 4 units. Do you need work?
23,000(1.035)^x=y
27316 or 27317 would be the population in 5 years