Which is a possible turning point for the continuous function f(x)?
Х
f(x)
-6
-4
-3
-2
-1
0
1
2
-4
-1
-2.
-5
-8
-16
O (-3, 4)
O (-2,-1)
0 (0,-5)
(1, -8)

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected