Someone help me please

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

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?

14+2 (56-1) this is an arithmetic sequence