(This is for math) Select from the following options:
[] y-intercept
[] (1, 7.5)

1. The value after 7.5 years.
2. The amount of time it takes for the value to decrease by one half.
3. The value after one year.
4. The starting value.

At the beginning of a call to the cable company, a message tells customers, "after you finish talking to our customer service representative, you will be asked to take a five-question survey about the level of service you recieved. it would be appreciated if you could stay on the line to answer the survey questions." what type of sampling is the cable company using?