# Search results

Try this ...
2. ### Maths Ext 1 - Got Some Questions

Does this help? It's a similar question and I reckon if you use the same approach, you should be able to work it out ...
3. ### Math Ext 2 - Got Some Questions

These rectangles and curves questions pop up quite a bit in relation to inequality proofs, so it's good to get comfortable with the technique. Here's a few similar questions I've seen on this front:
4. ### Maths Help

P(B | A) = P(B and A) / P(A) ... in this case, let A be winning the first season, and B be winning the second season
5. ### Doing Extension 2 Math Year 12

Funnily enough I got exactly 94 for my extension 2 HSC mark. From memory I had a crack at everything, but there was one question where I was just stabbing in the dark. This was back when Extension 2 HSC exams only had 8 questions, so I’d say I felt good about 7/8 of the questions to end up with 94 …
6. ### A general question for limits

Yes good point well presented!
7. ### A general question for limits

Oooooh yes very good point! ... What about this approach? (I squared top and bottom to simplify instead) ... Or does this approach also have an issue?
8. ### A general question for limits

Is it 1? ... My instinct was to try and get that x out of the denominator ...
9. ### What Happened here?

Doesn't this simply mean that when x=1, the steepness of the tangent of the curve y=x^r happens to be r?
10. ### Calculus help- velocity and displacement

Is it just multiplying everything in the 2nd last line by e^t ... ?
11. ### The content of this question seems new to me, even thought I’ve studied the necessary chapter in the textbook and class. Can someone explain this Q

Haha nah just the questions that people send me, plus the few common content ones that I came across in a SMH article. I think it's just a big coincidence that all the questions you happen to be struggling with are ones that I've already covered.

15. ### What is going on here? Can someone explain, I don’t get anything happening in this image.

No worries! It was really a coincidence as someone had already asked me the same question quite soon after the exam last year.
16. ### What is going on here? Can someone explain, I don’t get anything happening in this image.

How to determine the stationary points of f(g(x)) using only the charts of f(x) and g(x)
17. ### Binomial expansion

This is eerily similar to Q14 a) of the 2020 Extension 1 exam. I made a video working through the explanation, which you might find helpful when thinking in general about the benefit of the "equating of coefficients" technique. Enjoy!
18. ### Impossible continuous probability question?

https://faculty.math.illinois.edu/~hildebr/461/continuous1.pdf Try taking a look at this link. I remember this from uni. The definition of a continuous random variable is that P(X=x)=0 for any x, so I reckon that is what the question writer was thinking when they wrote this question 🤔
19. ### Impossible continuous probability question?

Oh wait, is this a trick question? If it is a continuous random variable, is the probability of a single point just 0? Since for continuous random variables you can only find the probability between ranges?
20. ### Impossible continuous probability question?

My mind went straight to the exponential distribution when I read this (which only has one parameter, the mean). Is that a distribution you have learned about?