VCE General & Further Maths Question Thread!

[lala1911]

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf
Networks, Q6
How is the cut 23? I thought 5 was going in the opposite direction.

[Damoz.G]

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf
Networks, Q6
How is the cut 23? I thought 5 was going in the opposite direction.

Gotta be careful with that Question, because you have to look at the previous bit before it on the 6. The "6" has to go somewhere, so it has to go down the 5 and then move towards the right hand side. However, with the 8, the previous 11 can go through either the 5 or 2 so there are other alternatives as opposed to the 8.

Therefore, you omit the 8, but include the 5. Does that help?

[jpf299]

need help for core
http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf

Q7 and 8 please

[pumpkinbread]

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf

Number patterns, question 8.

How is it A? I thought if r>1 the graph should be positive?

Thanks

[serendipity21]

need help for core
http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf

Q7 and 8 please

need help for core
http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf

Q7 and 8 please

Question 7:
We can see that the relationship between the variables is positive-immediately cancelling out options D and E.
The dots are close to one another and in a completely straight line, so it cannot be A as a 0.98 shows a strong relationship.
0.23 is no relationship, but there is some sort of relationship between the variables, the dots aren't totally random in their placement! So that leaves us with B

Question 8:
Cancel E straight away as foot length is the x variable, not the y.
Pick 2 clear points that are on the line. For eg. (30,180) and (34,185) and get the gradient of the line using rise/run method ie y2-y1/x2-x1.

Get the c value (cause the line will be in the form y=mx+c) by subbing in another point say (28,177)

[jpf299]

Question 7:
We can see that the relationship between the variables is positive-immediately cancelling out options D and E.
The dots are close to one another and in a completely straight line, so it cannot be A as a 0.98 shows a strong relationship.
0.23 is no relationship, but there is some sort of relationship between the variables, the dots aren't totally random in their placement! So that leaves us with B

Question 8:
Cancel E straight away as foot length is the x variable, not the y.
Pick 2 clear points that are on the line. For eg. (30,180) and (34,185) and get the gradient of the line using rise/run method ie y2-y1/x2-x1.

Get the c value (cause the line will be in the form y=mx+c) by subbing in another point say (28,177)

thank you so much! i always overthink the question

[plato]

http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2010furmath1-w.pdf

Number patterns, question 8.

How is it A? I thought if r>1 the graph should be positive?

Thanks

If the first term is a negative and it is multiplied by a positive number greater than 1, the result is a greater negative. Therefor the graph must decrease as n increases.

Maybe you are you confusing r (common ratio) with r (correlation coefficient).

[pumpkinbread]

If the first term is a negative and it is multiplied by a positive number greater than 1, the result is a greater negative. Therefor the graph must decrease as n increases.

Maybe you are you confusing r (common ratio) with r (correlation coefficient).

Oh man yeah I was. Thanks so much

[duhherro]

Argh , still confused on Q9 of 2012 Ex 1 Networks.

[lala1911]

There are five paths.
BGIJ - 17
BDFJ - 18
BDCEHJ - 19
AFJ - 14
ACEHJ - 15

You could assume you cannot reduce J to zero but, if you could, it means every one of these paths is reduced by one and the critical path would be 18 long.

You need to reduce an activity on the critical path, BDCEHJ.
You can only reduce one of C, E or H by one hour, otherwise you make BDFJ become a critical path of 18 which means only a one hour reduction.

D cannot be reduced below zero and so you must reduce B which will also reduce paths BGIJ, BDFJ and BDCEHJ. But you cannot reduce these paths to be less than 15 which, if you did, is where ACEHJ would become the single, new critical path (and also activity B would disappear with zero time).

So – reducing B (and the project) by four hours will make two critical paths, ACEHJ and BDCEHJ, both 15 hours long. This is a four hour reduction and the answer is D.

Such a great explanation. Thank you.

[plato]

Argh , still confused on Q9 of 2012 Ex 1 Networks.

Time  Activity   Person
0-3         A      John
3-10       D      Lisa can start D when A finishes.

0-6         B      Ken can start B at 0.
                      He cannot start C until he finishes B at 6
                      Lisa cannot start E until she finishes D at 10

6-10      C      Ken has finished B and can start C at 6

10-16    E      Lisa has finished D and can start E at 10

10 -15   F      John can start F when Ken finishes C at 10

G can be done by anyone available when C finishes at 10. Lisa is busy with D and John is busy with F. So Ken can do G finishing at 17.

H can be done by anybody available when all of D, E and F have finished. Of these three, the last to finish is E at 16 and John or Lisa are available. Then H can finish at 21.

So, earliest finish of the entire project is 21 (D)

[lolipopper]

hey can someone tell me when to use each sort of graphical display, such as stemplots, boxplots etc.

[ricebubbles123]

is this statement correct? If a graph can be rearranged to be planar, it is planar?

Thanks for the help

[lolipopper]

is this statement correct? If a graph can be rearranged to be planar, it is planar?

Thanks for the help

yeeeeeeah.

[tcstudent]

i dont understand how this question is 4 hours, i got it wrong when i did it in timed  conditions, then i went and did it after i finished and got 5, i took the maximum time which is 19, minus by the minimum which is 14 = 5''



heres pic, apparently its D-4 hours