Answer:
B. A sample in which the subjects themselves decide whether to be included in the study.
Step-by-step explanation:
In other words a voluntary response sample is a sample made up of volunteers o people who choose to be inlcuded.
Answer:
15 hours
Step-by-step explanation:
is the number of hours that Liam volunteered in the first month
The next month he volunteered 
times the time he volunteered the first month.
Total time he volunteered in the two months is 40 hours so
Time he volunteered in the first month is 15 hours.
D- 2x-1
plug in a number for x and you'll see
(1/2) ^2 = 1/2 * 1/2 = 1/4
1/4 < 1/2
All work shown, I hope that this works!
