Explanation
In this sample, people elect to participate or self-select to do the survey. Often, these folks have a strong interest in the main topic of the survey.
In essence, they volunteer to inform the trucking company about the activities of their drivers. That makes this a voluntary sample.
Answer: Voluntary Sampling Method

solve for "a", to get the coefficient, and then plug it back in the equation.
Answer:
a^2.
Step-by-step explanation:
The greatest common factor is a^2. It cannot be 3ab or 3a^2b because b is not present in the last term (a^2). Similarly there is no 3 or multiple of 3 in a^2.
Answer:
cylinder 62.83
cone 20.94
almost 3:1
Step-by-step explanation: