ANSWER

EXPLANATION
We use the formula

For

and n=8, r=4.

This simplifies to

We expand the numerator using factorial notation,

The common factors cancel out.


Answer:
i do not know how to do this yet but it looks like a high school thing
Step-by-step explanation:
Answer:
10 cm
Step-by-step explanation:
we know that the perimeter of a rectangle= 2(l+w)
given that the perimeter is 46 cm and length is 13 cm, so by putting the values we get,
2(13+w)=46
= 26+2w=46 (opening the brackets)
= 2w= 46-26
= 2w=20
= w=20/2
w= 10 cm
Cheers.
Sounds like a good deal to go swimming!