Answer:
(9,12)
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
The sampling method applied is Cluster sampling. 
Step-by-step explanation:
A cluster sampling method is the type of sampling where first the entire population is divided into homogeneous groups. Then a random sample of these groups are selected.
After selecting a sample of groups, a random sample of fixed size is selected from each group.
In this case all freshmen are first divided into 30 sections, then 4 random sections are selected and the students in those 4 sections are sampled.
The sampling method applied is Cluster sampling. 
 
        
             
        
        
        
Answer: 2 and 1/4 cups of oats (9/4 cups of oats)
Step-by-step explanation:
We know that, for the recipe, we need 3/4 cups of oats.
Now, you want to triple the recipe (then you need to use 3 times more ingredients).
This means that, if for the recipe you needed 3/4 cups of oats, when we triple that we have:
3*(3/4 cups) = 9/4 cups
This means that you need to use 9/4 cups of oats.
And we could also write this as:
9/4 cups = 8/4 cups + 1/4 cups = 2 + 1/4 cups of oats.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
y and x are the point while 'm' is the slope and 'c' is the intercept
or using calculus
differentiating y with respect to x
dy/dx=m 
which is the required slope