Asap this is due in an hour ! i need these two only to finish !

2 . a pile of sand on the beach has the approximate shape of a cone with a diameter 28 in. and a height of 11.75 in.

what is the best approximation for the volume of the pile of sand ?

a) 2411.7 in^3
b) 3617.5 in^3
c) 7235.1 in^3
d) 9646.8 in^3

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