Search results

When they are at right angles you will get p^2+q^2=28 When they are at 30 degrees with each other, note that the resultant vector is the diagonal of a parallelogram which has sides p and q. You can then use the cosine rule to get pq=8\sqrt{3}

They're all going to health care workers first. Best case scenario is general public access around March 2021. That is still 3-4 months away. I think a lot of people have similar thoughts. The problem is that if everyone (or a significant enough portion) has the same mentality of waiting for...

Had another look at the US figures and once again they are just hopeless at flattening the curve as a nation. Hospitalisations are at their highest ever level now. Interestingly they were at similar levels in the first and second waves. This third wave is looking like their worst one yet...

FYI this question was from this year’s BoS trials

Double check your denominator terms

For b), find the sum of n terms of a GP with first term a and common ratio r. Do the same but with first term a and common ratio r2. Take the ratio of the sums and factor the differences of two squares and it should simplify to the result.

Can you elaborate? Including what you would like to see FYI one of the reasons we held the survey back in August/September was for exactly this kind of feedback.

Why can't you just upload past papers onto the Resources section of this site?

It’s mainly about the brand that has been built over many years with word of mouth. That usually assures parents (who usually fork the money) that they are safe bets in terms of value for money. There may be tutors out there that are genuinely better quality but without the brand they are often...

You went to Sigma for the BoS trials?

I think it would be safe to assume that if you didn't extrapolate to the origin (unless the origin itself is a data point), you would not lose marks because the validity of the trend still holds (i.e. there is nothing wrong or incomplete about it). If you did lose marks, it would certainly be...

For the first one, you can use the substitution u=x+1. For the second one, you will need to differentiate both sides of the substitution with respect to x and use the chain rule u^2=4-x^2 \dfrac{du^2}{dx}=-2x \dfrac{du^2}{du}\dfrac{du}{dx}=-2x x\,dx=-u\,du You can then substitute x dx and all...

For future reference, can you please post subject specific content content in subject specific forums?

Along with the whole issue of extrapolation as jazz519 mentioned above, I'm going to offer a mathematical/statistical explanation. What you're effectively doing is plotting a regression line (albeit graphically rather than mathematically). When you estimate the regression line based on your...

Sorry for the delay. Thanks again for your patience. Here are the results and the marking guidelines/comments with sample answers for the 2020 Chemistry BoS trial. Thanks to everyone who participated in our very first Chemistry BoS trial! Massive thanks to @jazz519 for his efforts in writing...

Hoping to release them later tonight

Per the link posted above: "TCOS and UAC have indicated that they will communicate any changes to the calculation of the ATAR to schools and students before affected students commence Year 11" Nothing official has been announced, so based on the above statement (which suggests they need to give...

Okay that’s enough.

Ok, thanks for clarifying.

So if you’re being sarcastic then you believe that women should be free to dress however they want?