Here's why:
<span>Say the 5 people are A, B, C, D, E </span>
<span>A shakes hands w/ B C D E </span>
<span>B shakes w/ C D E </span>
<span>C with D E </span>
<span>D with E </span>
<span>That's 10</span>
Step-by-step explanation:
Property: ![a(b+c)=ab+ac](https://tex.z-dn.net/?f=a%28b%2Bc%29%3Dab%2Bac)
<u />
<u>Use the Distributive Property:</u>
<u />![6(g+3) =6(g)+6(3)=6g+18](https://tex.z-dn.net/?f=6%28g%2B3%29%20%3D6%28g%29%2B6%283%29%3D6g%2B18)
6g + 18 is an equivalent expression when the distributive property is used.
Assuming the sequence goes on like this 11,-33,99,-297,891,...,
its general formula is
![a_n=-11\cdot(-1)^n\cdot3^{n-1}](https://tex.z-dn.net/?f=a_n%3D-11%5Ccdot%28-1%29%5En%5Ccdot3%5E%7Bn-1%7D)
So, the 9th term is