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Okay so, if I take on 11 units for my HSC with these subjects: Standard English 2 Biology 2 Chemistry 2 Senior Science 2 Mathematics 2 Extension 1 Mathematics 1 Say I do great in Ext 1. If they take your best 10 units, how does that work? S:

I am quite confused about these questions, and don't know how to go about doing them. Help would be appreciated (: 1. $If$ f(x)=5x-x^2, $find$ f(x+h)-f(x). 2. $Given $f(x)=x^2+4x-5, $ find $ f(x+h)-f(x) $ and also $ \frac {f(x+h)-f(x)}{h}. 3. $If $h(x)=10^x+10^-x$, show that $ h(2x)=[h(x)]^2-2

So I got a quiz recently, and I had almost no clue with some questions on what to do and how the answer was such. Help would be appreciated. Step by step, if possible >.< $1.Simplify: {\frac{2}{x^2-9}}-{\frac{1}{x-3}}-{\frac{4}{x+3} $2.Solve simultaneously for x: 3x-7\leq 2x-3\leq 5+x...

I will be doing my preliminary course in 2010 (NSW), and I was considering a career in medicine. My goal is to work in a hospital as a doctor(Physician?), the ones who do check-ups and stuff (My english sounds real bad here, but I just don't know what they are called! I looked it up and got...