How many tiles would it take to cover the Washington monument?

No tiles size given so we used a 6x6 (I looked up basic tile size.

I need the equation formula

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?