Interstate 91 is the longest interstate highway in the united states, connecting the cities of seattle, washington and boston, massachusetts. the interstate is 4,987,000 meters in length. if 1 mile = 1.609 kilometers, how many miles long is interstate 90.

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?