Answer:
0
Step-by-step explanation:
So we have the expression:

And we want to evaluate it for x=-4 and y=8.
So, substitute:

Multiply:

Add:

Evaluate:

So, our answer is 0.
And we're done!
Answer:
<em>5</em><em> players participated in the tournament.</em>
Step-by-step explanation:
In a small chess tournament, 20 matches were played.
Let us assume that n number of players participated in the tournament
As in each game 2 players play, so the number of ways they can play is,

As they played 2 games with every other participant in the tournament.
So the total number of games is,

But it is given to be 20, so





As
, so we get n=5.
Therefore, 5 players participated in the tournament.
The circumference is greater than 33 centimeters, it stands somewhere around 11 π.