There are 75 new houses being built in a neighborhood. last month, 1/5 of them were sold. this month, 1/3 of the remaining houses were sold. how many houses are left to be sold?

What are the relative frequencies, to the nearest hundredth, of the rows of the two-way table? group 1: a 15 b 45 group 2: a 20 b 25

2,10,-50 next two numbers geometric sequence

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?