To answer this we need the coordinates of the first three points.
 
        
             
        
        
        
First term (a) = -15
common difference(d)= -9-(-15) 
 = -9+15=6
So, 
 12th term(a12)= a +(n-1)d
 = -15+(12-1)×6
 = -15 + 11×6
 = -15+66
 = 51
        
             
        
        
        
Answer:
442554 square miles
Step-by-step explanation:
The area of a triangle is given by :
0.5*A*B*Sin(∅) where A and B are two sides and ∅ is the angle between them.
We will find ∅ by applying cosine rule:
 c^2 = a^2 + b^2 − 2ab cos(∅) 
Where ∅ is angle between sides a and b.
In this example: 
a=1028, b=1046, c= 965
Plugging in the values, we get ∅=55.4°
Applying the formula for Area:
0.5*A*B*Sin(∅)
0.5*1028*1046*Sin(55.4)= 442554 square miles
 
        
             
        
        
        
Answer:
the median marks the middle or the mid-point of the data and is often shown by the line that divides the box into two parts.
Step-by-step explanation:
hope this helps:)