Answer:
(a) 40,320
(b) 576
Step-by-step explanation:
(a) We are asked to find the number of orders in which four girls and four boys can walk through a doorway single file if there are no restrictions.
Since there are 8 people in total, so they can walk in 8! ways.

Therefore, four girls and four boys walk through a doorway single file in 40,320 ways.
(b) To find the number of ways in which four girls and four boys can walk through a doorway single file if the girls walk through before the boys.
The total number of ways would be equal to product of 4 girls walking first and 4 boys walking after.
4 girls can walk first in 4! ways and boys can walk after in 4! ways as well.

Therefore, four girls and four boys can walk through a doorway single file if the girls walk through before the boys, in 576 ways.
Answer:

Step-by-step explanation:
A rectangle has two pairs of parallel lines of equal length and each line of the corresponding pair are perpendicular to the other. Then, DF = GE. The length of GE is:
![l_{GE} = \sqrt{[4-(-1)]^{2}+[(-8)-(-1)]^{2}}](https://tex.z-dn.net/?f=l_%7BGE%7D%20%3D%20%5Csqrt%7B%5B4-%28-1%29%5D%5E%7B2%7D%2B%5B%28-8%29-%28-1%29%5D%5E%7B2%7D%7D)

A W-2 shows how much has been earned, and how much has been withheld for taxes.
Answer:
102
Step-by-step explanation:
Im not sure what you are asking is there another part to the question.