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When doing any calculus (differentiation or integration) with trig function you use radians. Because degrees are not a linear measurement.

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)

haha don't thank me, thank the guys who made it. It will keep you occupied for a while too :D

Also make sure you click on things as it gives you some information.

No worries :D

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

http://htwins.net/scale2/

That's true. Some people read solutions and think they understand, but when you give them a similar question, they have no idea.

Good question. Also realised your source of questions :P

I'm a bit late, but yes, 5kg. :D

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...

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.
...

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,...

Correct :D

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.

I got 30 units^2.

Anyone else care to try?

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...

.

Yeh sqrt(3) confirmed.

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...

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.

http://community.boredofstudies.org/showthread.php?t=284205&highlight=multiple+choice+hsc

http://community.boredofstudies.org/showthread.php?t=277764&highlight=multiple+choice+hsc

That's what i got, but I don't have answer lol

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

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

Are you serious?

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

2012 HSC hasn't finished so there are no rankings yet....