6 is the answer I believe
Answer:
c = 25y
Step-by-step explanation:
c = cost
<span>45 is 36% of 125
</span>
Hope this helps!
Answer:
4n²+2n as a factorial is given as:
![= (2n+1)!/(2n-1)!](https://tex.z-dn.net/?f=%3D%20%282n%2B1%29%21%2F%282n-1%29%21)
Step-by-step explanation:
We are given an expression which has to be converted into factorial form.
The expression is as follows:
![4n^{2} + 2n\\ = 2n(2n+1)\\ = (2n+1)2n\\](https://tex.z-dn.net/?f=4n%5E%7B2%7D%20%2B%202n%5C%5C%20%3D%202n%282n%2B1%29%5C%5C%20%3D%20%282n%2B1%292n%5C%5C)
Now we know that 2n+1 and 2n differs by '1' and the next smaller term is '2n-1'.
Hence, multiplying and dividing by '(2n-1)!'; we get:
![= ((2n+1)(2n)(2n-1)!)/(2n-1)!](https://tex.z-dn.net/?f=%3D%20%28%282n%2B1%29%282n%29%282n-1%29%21%29%2F%282n-1%29%21)
we know that x(x-1)(x-2)! = x!, so:
![= (2n+1)!/(2n-1)!](https://tex.z-dn.net/?f=%3D%20%282n%2B1%29%21%2F%282n-1%29%21)