Suggested Answers (and Discussion) of the Further Maths Exam!

[Syedali_]

Geometry Question 4 is E,

so the difference is 32 mins but is it before or after is the question.

Lets think about it from a different angle in this scenario perth and melbourne are on same time zone if the sun rises at 7 in melbourne it will rise at approximately 10 in Perth, 3 hours later which reflects the real life timezones. comparing the latitudes of each, Perth is 115°51″ E and Melbourne is 144° 57' E so as you more towards 0 degrees east the sun rise is later and due to in the question Portland is closer to 0 degrees east than Mallacoota the sun rise will be later and therefore the 32 minutes must be added giving 6.35 am.

Question 8 Geometry is D,

I did this without touching my calculator and ill explain how.

in the question we are given the linear scale factor is 2 therefore k²=4,
A single black flag has 4x the area of a white flag and since there are more black flags the total area of black flags is greater 4 times the total area of white flags.

A is wrong less than 4x, B is wrong must be more than 4x, C  is wrong less than 4x, E is wrong less than 4x. This only leaves D as an answer and therefore the correct one.

Regarding question 2 all ordinal data can have questions asked to where it can be viewed nominal to prove something is nominal you must show it cant be ordinal not that it can be nominal. Blood Pressure most agree is ordinal which in itself shows that the argument you cant have groups in ordinal data is wrong as low, normal and high are groups with grouped ranges of blood pressure. and age groups can therefore be ordinal its a question of can something be ordinal with only 2 categories? The definition of that is the answer to whether B is right or D is right.
(http://dissertation.laerd.com/types-of-variables.php) The definition of ordinal in this link says "Just like nominal variables, ordinal variables have two or more categories. However, unlike nominal variables, ordinal variables can also be ordered or ranked."
Investigating the quote 2 categories can be ordinal but it needs to be able to be ordered or ranked. Theres an easy way to order by ages so does that make B correct?

Yet again the if you think about it
Yes yu are less than 50 or no
Hence nominal
I think perception plays a part

[Cornrow Kenny]

I'm confident that Q2 of core is D, but I can see VCAA taking a simplistic view and saying the answer is B, or alternatively, remove the question entirely.

edit: Also, it's been discussed to death, we will found out the answer in just over a month, so let's move on 

[Syedali_]

I'm confident that Q2 of core is D, but I can see VCAA taking a simplistic view and saying the answer is B, or alternatively, remove the question entirely.

edit: Also, it's been discussed to death, we will found out the answer in just over a month, so let's move on 

A month

[bbbbbbb99]

Yet again the if you think about it
Yes yu are less than 50 or no
Hence nominal
I think perception plays a part

The point you are forgetting is anything ordinal can be analysed in a nominal way but anything nominal cant be analysed in an ordinal way. With the blood pressure you are normal or not normal so does that make it nominal?

the fact it has 2 has no bearing whether it is nominal or ordinal it is whether you can order it. Can you order age groups? Yes therefore it fills the criteria to be ordinal. All it has to do is fill certain criteria to be ordinal you cant disprove it to be, just prove.

[Syedali_]

Can someone explain the perpetuity graph ?

[bbbbbbb99]

Can someone explain the perpetuity graph ?

Perpetuity means that the value of the investment is always the same so a flat line at $80000 its initial value is the answer

[Cornrow Kenny]

Can someone explain the perpetuity graph ?

A perpetuity is an investment where the interest earned is the payment you received. Thus, the balance of the loan never changes as whatever interest is earned is paid out.

[Syedali_]

A perpetuity is an investment where the interest earned is the payment you received. Thus, the balance of the loan never changes as whatever interest is earned is paid out.

Though there is an increase in the perpetuity's value right ?
 

[surviveandderive]

Though there is an increase in the perpetuity's value right ?

Only if the payment received after each compounding period is smaller than the interest calculated. If it's the same, the perpetuity will maintain its value indefinitely.

[Syedali_]

Only if the payment received after each compounding period is smaller than the interest calculated. If it's the same, the perpetuity will maintain its value indefinitely.

But for Q 21 core
How do u know ?

[Rosella]

But for Q 21 core
How do u know ?

If a question mentions perpetuities then its value will remain constant, and as its value is initially $80,000, it will remain so for the life of the perpetuity.

[Syedali_]

If a question mentions perpetuities then its value will remain constant, and as its value is initially $80,000, it will remain so for the life of the perpetuity.

Bad mistake then

[Cornrow Kenny]

Only if the payment received after each compounding period is smaller than the interest calculated. If it's the same, the perpetuity will maintain its value indefinitely.

Then it's not a perpetuity 

Perpetuity's balance always remain the same. The interest earned is the payment.

[Syedali_]

so it B or D? Q2

[ayesha2011t]

so it B or D? Q2

You'll only find out on dec 12th, move on
Focus on maximising exam 2 marks now