What is the mean absolute deviation 20, 10, 30, 20, 50, 30, 40, 20
a. 8
b. 10
c. 12
d. 20
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It’s letter B , 10 , trust me baby doll .

The answer to your question is:  (x³ - 5) (x + 4)

Step-by-step explanation:

x⁴ + 4x³ - 5x - 20      /     x + 4                x = -4

                  1     4     0     -5     -20           -4

                      -4       0     0    +20

                   1    0      0    -5       0        =   x³ - 5

Finally   (x³ - 5) (x + 4) = x⁴ + 4x³ - 5x - 20