4/7 cannot be simplified anymore. 5/8 can't be simplified either.
Let's pick one person at random and call it the 'first'.
That person shakes hands with 29 other classmates.
Take another person different from the first, we'll call him the 'second'. Since he has already shaken hands with the first, he shakes hands with 28 other classmates.
The 'third' person will likewise shake hands with 27 other classmates, and so on.
Hence, the total number of handshakes is 29+28+27+...+2+1 = 29*30/2=435 handshakes
Differentiate using the exponential rule, which determines that ![\bf{\frac{d}{dx}[a^{x}] }](https://tex.z-dn.net/?f=%5Cbf%7B%5Cfrac%7Bd%7D%7Bdx%7D%5Ba%5E%7Bx%7D%5D%20%20%7D)
is 
when a=3.
Therefore, the correct option is "E". You just have to remove the parentheses.
Answer:
Option C -> None of the above.
Step-by-step explanation:
Given-
2 r + ( t + r )
<em>⇒ 2 r + t + r</em>
<em>⇒ 2 r + r + t</em>
<em>⇒ 3 r + t</em>
∵ 2 r + ( t + r ) = 3 r + t.
∴ The given expression is equivalent to Option C : None of the above.
Good Job
And always keep your eyes on ur own paper
