ordered pairs in which of these formats do not have to represent a function? (Length of side of a square, perimeter of square)

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?

Ithink i know it but i want to be sure so can you me out ?