AIBU to ask for help with a Maths question?

[Fernx0x0]

DD is trying to practice for her admissions test for Economics at University. She is completely stumped by some of the practice questions. Does anyone have any ideas how to arrive at the correct answer for the attached questions?

🤯

Those are rrrreeeeeeaaaly hard.

There is an app (free) called Photomath which is pretty good - no idea if it would cope with something this advanced but worth a go?

For the first one is suggest that she tries some small data sets of seven nice data values and sees what happens as she follows the instructions.

For the circles question has she tried drawing a diagram?

For the third question, what does she know about stationary points?

(Is she taking A Level Maths?).

The first question is missing some words from the 3rd line.

She’d be better off getting a revision book and learning the method, no? There are specific books that go step by step through how to reach the answers.

my a level maths was a v long time ago, so

q1 - no idea
q2 - draw out the 2 circles & the radius etc. I think you get an overlap which is worth 2 equilateral triangles of side 1 plus 4 little curvy bits. and I could in theory work out the area of those
q3 - I'd try to remember how to differentiate to find stationary points in the function and hope that helped ...

There are maths revision specifically for economics ( if she’s not taking higher level maths)

Surely she should have a good idea how to answer them if she wants to get on the course? If she can't answer the questions she might want to think again!!

math.stackexchange.com/questions/402858/area-of-intersection-between-two-circles

Which test is she doing?

Wasn’t being rude about the get a revision book comment, BTW, if she’s stumped by these then she needs a bit of study. I could do a step by step but not sure it would help her if she doesn’t know where to start.

There's info missing from Q31 - some of the text disappears of the page.

Geometry isn't my strong point, so I'm afraid I'm not much use with Q33.

For Q34, I think you need to differentiate the equation then set it to zero. You'll have a quadratic which is hopefully solvable (this may mean nothing to you. Hopefully it'll mean something to DD!)

And if she’s still up
Looking at these she should just go get some sleep!

They look horrific. Couldn't you look for a maths tutor for her.

Isn't this saying this is NOT the economics course for her? Pick one with less maths focus.

Q31.
Assuming that the missing text says “This unique mode is not d.”
If the mode is d there must be more d than any other number. If you remove 2 numbers and the mode has changed (to e, say) then there are now more letter e than anything else.
So, both removed letters must be d. Possibly there were originally 3 x d and 2 x e.
If the original mean of n numbers is m, the total was mn.
Remove 2 x d.
New total is mn - 2d
The question says the new mean of n - 2 numbers is m+ 2.
This gives you another expression for the new total.
Make them equal. That gave me the answer E.

If I were doing this by hints I’d say the words but not give the answers, eg, If n numbers have a mean of m, the total is …?
If she can’t answer that, a simpler question would be, “ How do you find the mean of a list of numbers?”

Question 34.
This uses a standard method, and in my opinion is much more straightforward than q32, but only if she's got to that stage in her course.
It's explained here. www.bbc.co.uk/bitesize/guides/zcwhjty/revision/1
Differentiate to find the turning points (TP).
This gives a quadratic.
Use the discriminant b^2 - 4ac > 0.
This gave me the answer A.

• * [post edited by MNHQ by request] **

Oh my fucking god…. How bludy hard are they?!!!!

Sorry, I’m out 🤣🤯🤯🤯🤯🤯🤯🤯🤯🤯

Confused. Are they taking applications for 2022 already?

Just came here to swoon at the people who know how to answer this! Seriously impressive, fair play!

The economics exam for Cambridge tomorrow morning??

@MrsSkylerWhite

Confused. Are they taking applications for 2022 already?

Yes, of course. The early applications (med, vet, oxbridge) had to be in a couple of weeks ago. The Cambridge pre-assessments are tomorrow/Thursday, not sure about Oxford. (Don't know whether other economics courses do a test.)