What is 4y-3x???Pls help for math

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Build is 120 wide 20 feet high 48 feet long how many cubic feet and the volume

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?