VCE General & Further Maths Question Thread!

[MorgnD]

How do i find r when i am given the equation of the least squares regression line and not a table of values?

[plato]

How do i find r when i am given the equation of the least squares regression line and not a table of values?

A least squares regression equation can be found for any bivariate plot, regardless of the value of r.  Conversely, a known least squares regression line can fit an unlimited variation in the spread in a scatterplot.
Therefore, the equation alone cannot be used to find the value of r. You would need more information such as the standard deviation of both x and y and their mean values.

[dan97]

Hey i got a different answer to BoB regarding a networks question :/

The answer is apparently 5 but i found 6 trees

1- A-B-D-G
2- A-B-E-G
3- A-C-E-G
4- A-C-E-B-D-G
5- A-C-F-H-E-G
6- A-C-F-H-E-B-D-G

are one of these solutions wrong?

[dan97]

Another question from BoB... is the answer provided there wrong?

Question -  Draw a matrix of the graph.
The answer matrix says that A-C doesnt exist, however C-A does... is it wrong? Or am i missing something?

[plato]

Hey i got a different answer to BoB regarding a networks question :/

The answer is apparently 5 but i found 6 trees

1- A-B-D-G
2- A-B-E-G
3- A-C-E-G
4- A-C-E-B-D-G
5- A-C-F-H-E-G
6- A-C-F-H-E-B-D-G

are one of these solutions wrong?

All of your six trees are valid.

[plato]

Another question from BoB... is the answer provided there wrong?

Question -  Draw a matrix of the graph.
The answer matrix says that A-C doesnt exist, however C-A does... is it wrong? Or am i missing something?

The graph does not show a connection from C to A. Hence the matrix should not.

[RazzMeTazz]

Can't seem to get 83.6cm.
I got something like 85+ cm

cheers

I used similar triangles and got the ratio:

30/100 = x/12 (where x is the height of the smaller triangle.)
x = 3.6

The height of A above the ground is x + 80cm = 83.6cm

[_fruitcake_]

Hi couple of questions regarding backward scanning and critical paths

1) The question and graph in the attachment correspond to each other. The critical path by BoB is also shown there. That is wrong? Isn't it A-B-D-G?

2) How to go about the other question in the attachment? Help please. Thanks in advance
  ( i got this answer dont worry ) its 28%

[Berimbolo King]

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2011furmath2-w.pdf

Module 3 question 2 c and d
Looking at the solutions, i kinda get it but not 100%. Could some please show me in detail how they get the answer. Seeing this question made me consider re-evaluating my aim for a 45+ study score.

[_fruitcake_]

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2011furmath2-w.pdf

Module 3 question 2 c and d
Looking at the solutions, i kinda get it but not 100%. Could some please show me in detail how they get the answer. Seeing this question made me consider re-evaluating my aim for a 45+ study score.

Hi
 
Question 2C- you are looking for the breakeven point. Since the question is 'after how many hours' you can specify the exact breakeven point. They give u an equation d= -3x +16. Why dont we put this equation on the graph with michael this way we can see the breakeven point. The intercepts can be (0,16) and (5,1) Draw a line between these points and extending. The point where Michael and Katie meet is at 2 hours. This means that after 2 hours Katie passes Michael.

Question 2D-
3k apart can be from (Solve,Equation 1 (include time here)- Equation 2 = 3, time) on cas. This will give u a time of 13/8.

However the question asks u for how long they spoke to each other. You will have gotten this question right if u drew the graph. Because the line passes straight through at t=3... so 3 - 13/18 gives u the answer. Which is 1.38

Tips- Drawing the extra given equations with already an provided graph and equation is really important

[TheMereCat]

Hey guys, i hope everyone is doing well in further.

This is not really a further maths question but i was wondering where everyone is up to in their further maths course? have you finished all SACS and finished the course? Or are you still completing the Further maths content and SACS?

[_fruitcake_]

Hey guys, i hope everyone is doing well in further.

This is not really a further maths question but i was wondering where everyone is up to in their further maths course? have you finished all SACS and finished the course? Or are you still completing the Further maths content and SACS?

I finished all the content in holidays before term 1.. (nerd lol).. I am now going back and doing 5-6 questions in every exercise.. there's a few things i forgot

[TheMereCat]

I finished all the content in holidays before term 1.. (nerd lol).. I am now going back and doing 5-6 questions in every exercise.. there's a few things i forgot

Thats cool, dw i did something similar

Anyway have you finished al your SACS for the year?

[_fruitcake_]

Thats cool, dw i did something similar

Anyway have you finished all your SACS for the year?

No i have 2 more to go.. Can't slack off during those.. need 100% for both. I had an allergic reaction during my matrices sac and got 74% fml and its my forte lol

[TheMereCat]

No i have 2 more to go.. Can't slack off during those.. need 100% for both. I had an allergic reaction during my matrices sac and got 74% fml and its my forte lol

Damn, thats really unfortunate  But im sure you can easily score a 100% in your final two! What SACS are they anyway?

I only have Graphs and Relations and Trig & Geo left