Em certas regioes rurais do brasil areas são medidas em alqueires minerios .um alqueire mineirio é a area de um terreno quadrado de 220 metros de lado .qual é a area em quilometros quadrados de uma fazenda com 30 alqueires mineiros?

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?