Answer:
50,803,200 ways
Step-by-step explanation:
In this situation, since you should alternate girl-boy or boy-girl, the line-up can either start with a boy or a girl kicking which would yield one of the two following patterns:
BGBGBGBGBGBGBG or GBGBGBGBGBGBGB.
For each of those patterns, there are 7! ways to arrange all boys and 7! ways to arrange all girls. The number of ways that a line-up can be made for one round of kicking is:

There are 50,803,200 ways to set the line-up.
Answer:
A whole number that can be made by multiplying other whole numbers.
Example: 18 can be made by 3 × 6 so is a composite number.
16 can be made by 4 x 4 so it is a square root and a composite number
14 can be made by 2 x 7 so is is a composite number.
It is not a prime number as all Composite Number have factors other than 1 and itself). The first few composite numbers (sometimes called "composites" for short) are 4, 6, 8, 9, 10, 12, 14, 15, 16,
8x3 + 10x2 – 8x + 1
: Hope this helps :)
A number is a solution when it fits within the range of answers that the function generates.