<p>yup yup… thanks!</p>
<p>c) 40</p>
<p>Handshake rule: When one person does something with everyone else once.</p>
<p>[(n^2)-n]/2</p>
<p>Since this is 4 times, we multiply the formula by 4.</p>
<p>2(n^2)-2n</p>
<p>Substitute in 5 for n:</p>
<p>2(5^2)-2(5)</p>
<p>2(25)-10</p>
<p>50-10</p>
<p>40</p>
<p><a href=“Dropbox - Error - Simplify your life”>Dropbox - Error - Simplify your life;
<p>This one I’m sure won’t come in SAT… it’s too tough!</p>
<p>sorry for all the questions ^_^"</p>
<p>Before I look at that, there is a WAY WAY WAY easier solution to the last problem. I did it in a few seconds with no complicated math.</p>
<p>Team number 5 plays the other 4 teams 4 times = 16
Team number 4 plays the other 3 teams 4 times = 12
Team number 3 plays the other 2 teams 4 times = 8
Team number 2 plays the other team 4 times = 4
Team number 1 has already had all of its matches accounted for
16 + 12 + 8 + 4 = 40</p>
<p>Boom. And it was actually 50x simpler on my own paper but I explained it a bit for you.</p>
<p>Edit: It’s too early in the morning for me to begin trying to solve graphing problems lawl. I hate graphs.</p>
<p>^ I did this way and got it wrong… -_-</p>
<p>I guess i need to concentrate waaaay moree</p>
<p>I used dumbandlethal’s method and it is probably the best one IMO.</p>
<p>what about that last one? the last pic?</p>