Mathematics Question Thread

[ekhan_01]

Hi!

Can someone pls help, I have no idea what to do // the answer is A

Thank you

[RuiAce]

Hi!

Can someone pls help, I have no idea what to do // the answer is A

Thank you

Validity check: After 7 white marbles are added we have 10 green marbles and 15 white marbles. Pr(White) = 3/5 as expected.

[12070]

Hey,

I was wondering how I should study for Mathematics on Thursday. I have gone through about 7 CSSA trials over the past two weeks and I still feel weak with some areas like Max/Min but I could spend the next two days doing that topic only to not understand the question in the test. I want my study to be really efficient but am unsure how to achieve this.

[RuiAce]

Hey,

I was wondering how I should study for Mathematics on Thursday. I have gone through about 7 CSSA trials over the past two weeks and I still feel weak with some areas like Max/Min but I could spend the next two days doing that topic only to not understand the question in the test. I want my study to be really efficient but am unsure how to achieve this.

Potentially something like this:

Do one more past paper or something once you've recovered from exam fatigue today. Then focus on it tomorrow, because you only have one day left?

[12070]

Potentially something like this:

Do one more past paper or something once you've recovered from exam fatigue today. Then focus on it tomorrow, because you only have one day left?

Okay, I'll do the 2016 one again today and tomorrow should I do more past papers?

[RuiAce]

Okay, I'll do the 2016 one again today and tomorrow should I do more past papers?

Only if both:
a) You still have enough energy in you to
b) It's not too late in the day (you really shouldn't be doing a whole past paper the day before an exam after 6:30 PM)

[gh971]

Hey ATAR Notes,

My math trial exam is on thursday and I was wondering how best I should structure my time management because as I've been doing practice papers sometimes I do the test super quickly and then other times I don't finish.

Thanks!!

[RuiAce]

Hey ATAR Notes,

My math trial exam is on thursday and I was wondering how best I should structure my time management because as I've been doing practice papers sometimes I do the test super quickly and then other times I don't finish.

Thanks!!

A question to think about. Does anything (or things) in particular cause you to finish some early and struggle with others? E.g. The year of the paper, the company/school who writes it, a bunch of topics that you dislike, time of day you do the paper?

[winstondarmawan]

Hello! Would appreciate help with the following:
https://scontent-syd2-1.xx.fbcdn.net/v/t35.0-12/20615428_1287430571382463_536652419_o.png?oh=5e7214d5505fd8305c65d29000ccd6f7&oe=5981D56E
https://scontent-syd2-1.xx.fbcdn.net/v/t35.0-12/20616187_1287430424715811_1281406970_o.png?oh=3b04c1f9e87c952043520a56af576ba7&oe=5981C3A3 Parts (ii), (iii)

[RuiAce]

Hello! Would appreciate help with the following:
https://scontent-syd2-1.xx.fbcdn.net/v/t35.0-12/20615428_1287430571382463_536652419_o.png?oh=5e7214d5505fd8305c65d29000ccd6f7&oe=5981D56E
https://scontent-syd2-1.xx.fbcdn.net/v/t35.0-12/20616187_1287430424715811_1281406970_o.png?oh=3b04c1f9e87c952043520a56af576ba7&oe=5981C3A3 Parts (ii), (iii)

The other question is ambiguous, but I believe it's saying that 5 is certainly attained and must be the highest number.

Recall that the sum of two odd numbers is even but the sum of an odd and never number is odd. So effectively we need the second number to be even. So we want (4,5), (2,5), (5,2) or (5,4), where this bracket notation denotes (number on first roll, number on second roll).

[gilliesb18]

Hello, can someone please help me with this question:

Find the derivative of x^3 using first principles.

I know the answer, being 3x, but I don't know how to get this using first principles. Can someone help me?

Thanks soo much:)
B.

[EEEEEEP]

Hello, can someone please help me with this question:

Find the derivative of x^3 using first principles.

I know the answer, being 3x, but I don't know how to get this using first principles. Can someone help me?

Thanks soo much:)
B.

You sure it's 3x?

Shouldn't the derivative be 3x^2?

The result from using first principles and standard differentiation should be the same.

[RuiAce]

Hello, can someone please help me with this question:

Find the derivative of x^3 using first principles.

I know the answer, being 3x, but I don't know how to get this using first principles. Can someone help me?

Thanks soo much:)
B.

Not only is it 3x^2, note that you have to expand (x+h)^3 by expanding (x^2+2xh+h^2)(x+h)

[gilliesb18]

Sorry, yep I mean 3x^2
But once I have expanded that out, which is what I did in the first place but got no where, what do I do?

Mod Edit: Merge

[RuiAce]

But once I have expanded that out, which is what I did in the first place but got no where, what do I do?

Edit: Typo