Maricela had a bag containing 35 nickels and quarters. the total value of these coins is less than $2.50. what is the maximum number of quarters that meets these conditions?

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?