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Type: Posts; User: qwerty44

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1. ## Thread: ITT: Post Mathematics (2U) Questions/Problems

by qwerty44
Replies
63
Views
1,776

### Re: ITT: Post Mathematics (2U) Questions/Problems

When doing any calculus (differentiation or integration) with trig function you use radians. Because degrees are not a linear measurement.
2. ## Thread: Series and Sequences - Sum of a series

by qwerty44
Replies
6
Views
254

### Re: Series and Sequences - Sum of a series

Use simultaneous equations with variable a and d.

Then when you solve for a and d just find the sum when n=20

i.e.
a+5d=23
a=23-5d (1)

10/2(2a+9d)=210 (2)
3. ## Thread: How big is the observable universe? Find out here....

by qwerty44
Replies
20
Views
756

### Re: How big is the observable universe? Find out here....

haha don't thank me, thank the guys who made it. It will keep you occupied for a while too :D
4. ## Thread: How big is the observable universe? Find out here....

by qwerty44
Replies
20
Views
756

### Re: How big is the observable universe? Find out here....

Also make sure you click on things as it gives you some information.
5. ## Thread: How big is the observable universe? Find out here....

by qwerty44
Replies
20
Views
756

### Re: How big is the observable universe? Find out here....

No worries :D
6. ## Thread: How big is the observable universe? Find out here....

by qwerty44
Replies
20
Views
756

### How big is the observable universe? Find out here....

You will make no mistake in clicking this link, as it is quite interesting even for non-physicist:

http://htwins.net/scale2/
7. ## Thread: 2012 Year 9 &10 Mathematics Marathon

by qwerty44
Replies
711
Views
16,641

### Re: 2012 Year 9 &10 Mathematics Marathon

That's true. Some people read solutions and think they understand, but when you give them a similar question, they have no idea.
8. ## Thread: 2012 Year 9 &10 Mathematics Marathon

by qwerty44
Replies
711
Views
16,641

### Re: 2012 Year 9 &10 Mathematics Marathon

Good question. Also realised your source of questions :P
9. ## Thread: 2012 Year 9 &10 Mathematics Marathon

by qwerty44
Replies
711
Views
16,641

### Re: 2012 Year 9 &10 Mathematics Marathon

I'm a bit late, but yes, 5kg. :D
10. ## Thread: 2012 Year 9 &10 Mathematics Marathon

by qwerty44
Replies
711
Views
16,641

### Re: 2012 Year 9 &10 Mathematics Marathon

A mushroom farmer has sent an order of 70 kg of mushrooms to the markets in standard cases. If he had used larger cases, each capable of holding 2 kg more, he would have used 4 fewer cases.

What...
11. ## Thread: 2012 Year 9 &10 Mathematics Marathon

by qwerty44
Replies
711
Views
16,641

### Re: 2012 Year 9 &10 Mathematics Marathon

It's called LaTeX. http://www.codecogs.com/latex/eqneditor.php <you can try it out here

To post with it on here [ TEX ] *put code in here* [ / TEX ] without any spaces in the brackets.
...
12. ## Thread: 2012 Year 9 &10 Mathematics Marathon

by qwerty44
Replies
711
Views
16,641

### Re: 2012 Year 9 &10 Mathematics Marathon

Another thing you should keep in mind is that the side length of an equilateral triangle inscribed in a circle of radius R is R\sqrt3. This can be proved later with calculus. So in this case,...

by qwerty44
Replies
711
Views
16,641

Correct :D
14. ## Thread: Cool problem of the day!

by qwerty44
Replies
129
Views
4,810

### Re: Cool problem of the day!

The least common multiple of positive integers a, b, c and d is equal to a + b + c + d.
Prove that abcd is divisible by at least one of 3 and 5.
15. ## Thread: Cool problem of the day!

by qwerty44
Replies
129
Views
4,810

### Re: Cool problem of the day!

I got 30 units^2.

Anyone else care to try?
16. ## Thread: Atar /Rank Question

by qwerty44
Replies
6
Views
1,003

### Re: Atar /Rank Question

80 on all those subjects is about 82-84 ATAR.

Your looking at about 85 for every 2U subject there and about 40 for every one unit subject to break the 90 ATAR mark.

Or another way to look at...

by qwerty44
Replies
129
Views
4,810

.
18. ## Thread: Cool problem of the day!

by qwerty44
Replies
129
Views
4,810

### Re: Cool problem of the day!

Yeh sqrt(3) confirmed.
19. ## Thread: Cool problem of the day!

by qwerty44
Replies
129
Views
4,810

### Re: Cool problem of the day!

Here is another good one:

http://i46.tinypic.com/verlw9.jpg
The lengths of the sides of the octagon are 1, 2, 3, 4, 5, 6, 7 and 8 units in some
order. Find the maximum area of the hexagon...

by qwerty44
Replies
3
Views
233

### Re: Study Guides?

It depends on what you are looking for. Dot Point is mainly questions based on syllabus points while Excel is more of a summary with basic questions to test your knowledge.

by qwerty44
Replies
2
Views
242

22. ## Thread: Cool problem of the day!

by qwerty44
Replies
129
Views
4,810

### Re: Cool problem of the day!

That's what i got, but I don't have answer lol
23. ## Thread: Cool problem of the day!

by qwerty44
Replies
129
Views
4,810

### Re: Cool problem of the day!

Found a pretty good one that most 2U students should try.

http://i46.tinypic.com/jig64m.jpg
Find the area of the rectangle.

by qwerty44
Replies
17
Views
1,368

### Re: School Ranking

Are you serious?

For 2012 rankings to be released there has to be a 2012 HSC......