Answer:
the straight line will always equal 180 degrees.
180-125-35=20
the answer for the missing degree is 20
To find the cofactor of
![A=\left[\begin{array}{ccc}7&5&3\\-7&4&-1\\-8&2&1\end{array}\right]](https://tex.z-dn.net/?f=A%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D7%265%263%5C%5C-7%264%26-1%5C%5C-8%262%261%5Cend%7Barray%7D%5Cright%5D)
We cross out the Row and columns of the respective entries and find the determinant of the remaining 
matrix with the alternating signs.
Therefore in increasing order, we have;
<span>Pattern did the power of 4 shows:
Let’s have an example of the power of 4
=> 4 will be multiplied 4 times
=> 4 x 4 = 16
=> 16 x 4 = 64
=> 64 x 4 = 256
=> 256 x 4 = 1024
=> 1024 x 4 = 4096
=> 4096 x 4 = 16384
………………..
Did you notice the pattern? The last number of each answer always ends up with
4 and followed by 6.</span>
11) 39 2/9
12) 21 1/10
13) 22 3/8
14) 6
15) 10 5/12
16) 5 19/24
17) 6 2/3
18) 16 1/24
19) 15 19/24
20) 10 7/8
Number of people participating in the relay race = 4
Total distance ran by 4 people of a team = 400 yards
Let us assume the distance run by each member = x yards
Then
4x = 400
x = 400/4
x = 100 yards
Total time taken to rum the full distance = 53.2 seconds
Average running time of each person = 53.2/4
= 13.3 seconds.
