It appears as if 12cm is half the length of the side so we can assume that the total length of one side is 24cm.
The area of a square is given by the equation
where s is the length of the side.

A=576
The area of this square is 576cm2.
Hope this helps!
Answer:
All three chose a valid first step toward solving the equation.
All approaches are algebraically correct
Answer:
D) The population alternates between increasing and decreasing
Step-by-step explanation:
correct on edge