Please help it would mean a lot

The sum of 5consecutive even numbers is 100. what is the first number in this sequence?

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices

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?