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I only know three: E-commerce, Teleconferencing, and Messaging Systems, what are another two systems? EDIT: There's a mistake in the title, I mean what are "examples" of five communication systems.

The two curves are included in the picture below, I couldn't find the other x so it would be helpful if someone can help me but I want to also know if what I did so far in the picture was right, thanks.

I know my answer to this question is wrong because apparently I'm not meant to expand where there's a minus in the power, but why? Also, if there was no minus in the power, am I still able to expand? Am I meant to only expand when there's no minus in the power?

When I did question 7 on the page below, I got 0 and thought that can't be right since an area can't be zero, I did it again and I got -128 but an area can't be negative so my final answer was 128. I looked at the right answer and the answer is zero. I just want to get this straight, if it's...

I need help with question 5. d), I also want to know if the graph I drew was correct for the question or not, thanks.

I need help with questions 4 and 6 from the picture below, thanks.

It's not that I'm doing too much questions, but some questions I don't know how to do I repeat them a few times to see if I can do it at the end but I can't. I also ask on this website and that all takes quite some time for me to understand it. What do I do so I don't spend alot of time on my...

Find the areas enclosed by the following parabolas and x-axis, include a sketch of the graph: I did the question and I don't know what I did wrong, need help, thanks.

Do you just take a break or continue studying? If you study, do you study more than you do compared to weekdays? As in you study 4 hours weekdays and on weekends you study maybe 6-7?

I don't want to know when I'm able to view my HSC results, I just want to know how can I view them via my board of studies account.

Is it true that if you include the full working out for a question and it's right, you will get full marks even if you get the wrong answer because that would be seen as a calculation error, and the marker would see that you understand the concept since you included full working out. Is this true?

Looking at the picture, what did I do wrong? Everything seems fine to me but the answer isn't 1/2, it's 0. I got a feeling that the way I factorised the question was wrong but everything else seems fine, what did I do wrong?

I've heard by some that the deadline is before the half-yearlies, and others say you can drop before the first day of the HSC exams, when am I able to drop?

I just completed my maths homework and it took me 2 hours, I feel like that I'm doing too much question and I should be skipping some. Anyone else in the same position for maybe English? History? How do you deal with this?

If Person A and Person B are in the same 2-unit class, but Person B does 3-unit while Person A doesn't. Person B is coming 1st for 3-unit, and Person A is coming 1st for 2-unit, Person A gets the highest mark in 2-unit and his mark is 90. Does Person B get Person A's mark for 2-unit? Is this...

If one of your friends comes up to you and asks how many hours do you study? Do you respond honestly or try to say less hours than you actually study? Do you give an impression to your friends that you're not a hard worker but you actually are so you end up surprising them after the exams?

Is there a place where I can get some past half-yearly papers for subjects like Maths, Bio, etc?

Is it part of the syllabus? Why isn't it mentioned when you go on this sub-forum?

Usually when I get Maths homework, after I complete about 5-6 questions, they start to get repetitive, do you still complete all the questions or you pick them out?

What I basically mean by the title is that if someone is doing 2-unit and 3-unit (in this case 3-unit is considered as one unit), and the HSC only counts your top 10 best units, what are other chance of 3-unit being counted? What I also mean is if someone is doing 6 subjects including 3 unit...