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Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread I think you're thinking of a different question of appleibeats. I was answering this one, which has an X in it: .

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Yes, it means they're perpendicular. This is because angles AMO and BMO are equal since triangle AMO is congruent to triangle BMO. Since they are adjacent angles on a straight line, each is 90 degrees.

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread $\noindent Note $\angle XAB = \angle XBA = \alpha$, say (you probably showed this when you showed the triangle $ABX$ is isosceles). Then $\angle AXB = 180^\circ -2\alpha \equiv \beta$ say (angle sum of $\triangle ABX$ is...

Re: Extracurricular Integration Marathon Nice. So it's not actually IB-related?

Re: Extracurricular Integration Marathon Is Quizlet an online thing, or paper-based?

Is the reason the teachers marked that wrong that they didn't understand the theory themselves? If you have access to other years' papers from that school, you could maybe check how correctly those ones were marked, to see if this is a recurring problem.

Yeah it should be B) (Simpson's Rule).

Which answer was marked correct here?

Wouldn't the students have complained if there were so many blatant errors?

Yeah it appears that these markings are quite unreliable.

In that case, yeah, answer should surely be +/- 0.25%.

But you said the answer was D) – is this reliable?

How reliable are the answers of the question's source?

Actually realised it said +/- 0.5%. In the case of +/-, I reckon the +/- 0.25% is more correct. This would be because measuring to the nearest millimetre means that the measurement is 200 mm +/- 0.5 mm. So the error should be +/- 0.25%. Maybe General Maths has some formula for these Q's that...

Since it's +/- 0.5 mm, the total uncertainty in the reading is 1 mm, so the answer is whatever 1 mm is as a percentage of 200 mm, which is 0.5%.

Those notes aren't referring to percentage error, they're essentially referring to implied absolute error (half the limit of reading). So to get the percentage error, we would divide these by the measured value (200 mm for the question at hand). By the way, for your notes on Error, they should...

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Hint: draw the line through D parallel to AB.

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread $\noindent Note that we are told that the bee is moving twice as fast as the bulldozer. Therefore, at the time the bee meets Bulldozer B, it has travelled twice as far as Bulldozer B. Since the bee is going right from $x=0$ and...

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread Yes the GP method is the other way to do it, and was probably the way the book expected students to do it. But this requires (slightly) tedious calculation, whereas the answer can be obtained with essentially no calculation...

Re: Year 11 Mathematics 3 Unit Cambridge Question & Answer Thread $\noindent To see why the answer to the last part is just the initial separation $d$ (in this case $d = 36$ m), note the following key observations:$ $\noindent 1) The bee travels for the entire time $T$ at a constant speed of...