Answer: Well sampling is the process of choosing a representative sample from a target population and collecting data from that sample in order to understand something about the population as a whole. A data sample is a set of data collected and the world selected from a statistical population by a defined procedure. 
Step-by-step explanation:
 
        
             
        
        
        
Answer:
14 would be your answer :)
 
        
             
        
        
        
Answer:

33 gallons of water to begin with. 
Step-by-step explanation:
So we essentially are given two coordinates: (6,87) and (21,222). To find an equation, we simply need to find the slope and y-intercept. We know it's a linear equation because it's a steady stream, meaning a constant slope. 
The slope is: 

So, the rate at which the stream flows is 9 gallons per minute. 
Now, let's find the initial amount of water. To do this, we can use point-slope form. Pick either of the two points. I'm going to use (6,87). 

So, there were 33 gallons of water in the tank to begin with.