Answer:
-16
Step-by-step explanation:
 
        
                    
             
        
        
        
Since the shape is a quadrilateral, the interior angles add to 360 degrees. Thus, angle C is 360 - 82 - 92 - 102 = 84 degrees.
        
                    
             
        
        
        
The mean absolute deviation is 10.52.
<h3>What is the mean absolute deviation?</h3>
The mean absolute deviation of a dataset is the average distance between each data point and the mean. It is a measure of variation of a data set. 
MAD =1/n  ∑ l x - m(x) l
Where: 
n = total numbers in the data set 
x = number 
m(x) - median
The first step is to determine the mean of the data set: (42 + 31 + 1 + 1 + 2 4+ 5 + 6 + 7 + 3) / 10 = 10.2 
Find the absolute value of the difference between the number and the mean. Add the result | (42 - 10.2) + (31 - 10.2) + (1 _ 10.2)  + (1 - 10.2)  + (2 - 10.2)  + (4 - 10.2)  + (5 - 10.2)  + (6 - 10.2)  + (7 - 10.2)  + (3 - 10.2) = 105.2
Divide the sum by the total number in the dataset = 105.2 / 10 = 10.52
To learn more about mean absolute deviation, please check: brainly.com/question/27365177
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Answer:
(-1, 7, 2)
Step-by-step explanation:
we suppose that ax + by + cz = d for the matrix
D = det [ 0    4     7] = 100
               -6   0    -2
                1    2     8
Dx= det [ 14    4     7] = - 100
                10   0    -2
                -3    2     8
Dy= det [ 0    14    7] = 700
                -6   10    -2
                 1    -3    8
Dz = det [ 0    4    14] = 200
                -6   0     10
                 1    2     -3
So the solution is:
x = Dx/D = -1, y = Dy/D= 7, z =Dz/D = 2
(-1, 7, 2)
have a good day!
 
        
             
        
        
        
The answer should be C. 
Hope this helps