PLEASE HELP I'VE BEEN TRYING FOR A WHILE NOW 15 POINTS TO THE RIGHT ANSWER

A bucket contains 6 green rubber balls, 4 red rubber balls, and 8 purple rubber balls. Alex removes 3 rubber balls, without replacement, from the bucket.

What is the probability that Alex removes a green ball, red ball, and purple ball in that order?

How many zeros does the function f(x)=4x3-x2+1 have

Is the number 128.439 a rational number

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