Melody

sin(x)=20.8*6*0.5

sin(x)=62.5

There is no answer to this.  sin(x) must be between -1 and 1

950 in 1045

950/1045 *100 then put the % sign

You have not asked a question, so it is difficult to answer. :/

I assume you want the equation of the line.  Is that your question?

Also,

Can you please put your question in the body of the post, not just in the title because many answerers want to copy and past it into their own answer and we cannot do that if it is only in the title.

Thanks :)

Because you already said hi on this same page. You are just repeating yourself.

This is a maths forum not face book.

Most socializing should  be done as private messages.

A little bit of fun on the forum is good but much of it should be done on the same thread.

Plus, this kind of inane post is attracting some very unsavoury responses on the forum. 

Hi Nauseated,

Your answer:

Consider this the same as unique combinations of 2 from integer set {n}

1 person, 0 pair

2 persons, 1 Pair
3 persons, 3 Pairs
4 persons, 6 Pairs
5 persons, 10 Pairs
6 persons, 15 Pairs

7 persons, 21 Pairs

8 persons, 28 Pairs

nC2 unique pairs   

-----------------------------------------------------------------------------------

You have found how many individual pairs can be made from 8 people.

That is NOT the question.

If there is three people, or any odd number of people in a room, they cannot all be paired of so the question would make no sense.  There would be no answer.

 You have said that if there are 4 people in a room there would be 6 pairs. This is not correct.

These are the the possible combinations

AB    and   CD

AC   and   BD

AD   and   BC

There are no other possible combinations.  So there are 3 combinations.

If there are 6 people in a room then you are correct, there are 15 combination.

because

IF E and F are together there are 3 ways the others can be combined, as shown above.

IF E and A are together there are 3 ways the others can be combined, as shown above.

IF E and B are together there are 3 ways the others can be combined, as shown above.

IF E and C are together there are 3 ways the others can be combined, as shown above.

IF E and D are together there are 3 ways the others can be combined, as shown above.

So there is a total of 3*5 = 15 ways that 6 people can be paired off

Now there  there is 8 people in a room    A, B, C, D, E, F, G, H

G and H are together then there are 15 ways the others can be paired.

G and A are together then there are 15 ways the others can be paired.

G and B are together then there are 15 ways the others can be paired.

G and C are together then there are 15 ways the others can be paired.

G and D are together then there are 15 ways the others can be paired.

G and E are together then there are 15 ways the others can be paired.

G and F are together then there are 15 ways the others can be paired.

G and  are together then there are 15 ways the others can be paired.

So there are  15*7 = 105 ways that the people can be paired

etc

If there are 2n people in the room then there will be 1*3*5*7*........*(2n-1)  ways that they can be paired.

According to OEIS   (Online Encyclopaedia of Integer Sequences)

This sounds like a question for Google I think.

Mon 6/12/15

Riddle      Thanks DragonSlayer554

https://web2.0calc.com/questions/riddle-of-the-morning

Altitude and Pressure    Thanks Heureka

http://web2.0calc.com/questions/logarithmic-equations_1

Trig transformation   Melody

http://web2.0calc.com/questions/transformation-of-sine-function

Determining the equation of a sine curve.      Melody

https://web2.0calc.com/questions/find-the-equation-of-a-sine-function-that-has-a-period-of-pi-amplitude-5-a-vertical-shift-of-zero-and-passes-through-pi-6-5-2

What 4 consecutive odd numbers multiply to a square number.    Thanks Melody and Heureka

http://web2.0calc.com/questions/what-square-is-the-product-of-four-consecutive-odd-integers

Probability   Thanks Nauseated, Alan and CPhill

http://web2.0calc.com/questions/five-cards-are-drawn-at-random-from-a-pack-of-cards-that-have-been-numbered-consecutively-from-1-to-97-and-thoroughly-shuffled

@@ What is Happening?  [Wrap4]   Sat 5/12/15   Sydney, Australia Time 11:43 pm   ♪ ♫

Good weekend :)

Answer credits go to CPhill, Alan, Omi67, Heureka, Hayley1, Beababy, LambLamb, Geno3141, Mathcalc. buubleman and Einstein Jt.  Thanks Guys  (  That includes the girls when used by an Australian in this context     ) 

Technical Issues

IDK, is the picture upload working - it wasn't the last time i tried it. ://

How can you post a picture when the picture upload on the forum is not working properly ?

Thanks very much Alan for these instructions.

Hi LambLamb,

Those reCAPTCHA thingys are especially obnoxious when you are on a phone.  The pictures are too small and they won't stay on the screen properly.  It is difficult to tick the right ones.  They are horrid.  I don't mind the circle thing but those pictues should be flushed. :/  On my computer I never get those pics.  I assume non members get them all the time.  But for some reason I sometimes get them on my phone.  I don't know why.  One of life's mysteries I guess. ://