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I'm having trouble with 2014 HSC question 18, why is it B? I thought it was D because it takes a total of 13 days to complete the whole upgrade, so how could 8 be the minimum?

What are some common trig identities that I should know of for the HSC? I know for example sin/cos = tan, what other common trig identities are there?

I need help with this question, I want to know why you flip 0.77 to -0.77, how do I know when to flip it? How do I know what reaction to flip in the future?

Trials are coming up and I don't want to do bad like everyone else, and IPT is my weakest subject. I pretty much don't know anything except maybe a few things and I really need to improve. But how? What sort of things should I doing for IPT? I find IPT pretty different to subjects like Biology...

I'm having trouble with 2014 HSC question 13 b. ii) What I dont get is if the half life of the material is 300 years, doesn't that mean it takes 600 years for the material to completely decay? How could you figure out what is remaining after 1000 years?

I need help with this question, I don't really know how to answer these sort of questions without equations.

Here's a HSC question that I attempted and here's my working out for question i), however the success one working out for this question had the answer as Pi, I went further than that using the ASTC rule and was wondering why didn't the success one working out include what I done?

I need help with question 10. b), thanks.

The answer for this question is D, but can't it be A also? Aren't they both the same thing?

From a set of 4 cards, consisting of the Kings from a normal pack, 3 are chosen at random. Find the probability that the two red kings would be included in the 3 cards chosen.

I want to know the answers to all of these questions as I'm not sure if my answers are right, so if you could please answer these questions (doesn't need to have working out), I'll really appreciate it.

How do I know the difference between these three? I know what time payments are but I don't know if a question is asking for the compound interest formula or the superannuation formula.

I need help with this question, and also please explain how you came up with your working out because this is a tricky question, thanks alot!

I need help with with this question, I don't know how to do this and I need someone to simply explain how to do this, thanks! I did inverse tan(-1/Root3) and that gave me -30 but none of the answers were related to -30.

Many times my teacher has told our class that you may not be able to solve these questions because the "HSC stress", I don't know if because I haven't felt the HSC stress but I decided to look at past HSC questions for series and sequencing because I have a topic test coming up, and most of the...

Solve tanx=2, express your answer in radian measure correct to two decimal places. I have no clue doing this question so please take it easy while explaining, I want to know the method to answering these type of questions so I can answer other questions similar to this, thanks!

I need help with question iii) and iv) thanks!

Let's say y = sin(x) + cos(x) and x = 5Pi/3. When subbing in x to find y, should the calculator be in radians mode if subbing in 5Pi/3?

I need help with ii) and iii). I just want to know for ii) why in the solution was y=1.35. For iii), what is the formula T = 2Pi/a? I've never seen it before.

I need help with question 19 a). Here's the question: