What would the simplified answer be?

What describes horizontal cross section of the right rectangle 6m 8m 5m

What is the sum of the first 8 terms of the geometric series

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected