What is the volume of a cube with a length of 6 yards

With math question will mark brainliest question in the pic.

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?

Which concept can be used to prove that the diagonals of a parallelogram bisect each other?