Solutions (3 Viewers)

[jordz007]

Can anyone confirm me please?

No it has to be 1:2 as they asked for a side of the smaller triangle in ratio to the larger triangle therefore they cant be even...but rather the side of the larger triangle is double the smaller triangle.

 

[shawty-snappin]

5bii isnt it 1/3 as well? (is it 2/3 x 1/2) ie probability of not in the first, and not in the 2nd as well?

ah i didnt round off the number of months for the loan repayments. will i lose marks?

 

[Bdogz]

No it has to be 1:2 as they asked for a side of the smaller triangle in ratio to the larger triangle therefore they cant be even...but rather the side of the larger triangle is double the smaller triangle.

ohhh crap yeah i realise now thanks

 

[Thecorey0]

why X2600 for 9bii?
if we times 1000 from R to S, Q to S
then isn't we should times 1000 from P to s as well?

The pipe costs $2600/km under the water, and $1000/km on land. The line PS is underwater.

 

[Currlz]

The pipe costs $2600/km under the water, and $1000/km on land. The line PS is underwater.

When I first looked at it I had to carefully think about underwater and on the shore, the diagram was pretty shit tbh.

 

[meilz92]

8biv) and 9bv) i definately got zero for each of these...

how much were they worth?
not too much i hope, because i also definately lost 6 marks on Q10 for non-attempt



sooooo not getting a band 6.

 

[HTB]

yes, 5bii is 1/3

2/3 * 1/2
= 1/3

 

[Thecorey0]

Edited. This team-work is quite depressing. My mark is down to 115 now

 

[carlytse621]

haha....i mixed them around.....
oh no.....I got iii right......and initially i got i and ii right.....
then i change it....i don'tknow what was i thinking.....
and i think i scribble my previous answer......
oh no...............

 

[Currlz]

Edited. This team-work is quite depressing. My mark is down to 115 now

Where did you lose them so far?

Did you put the greater and less than or equal to in the exam or just less than / greater than in that one i posted about?

 

[Thecorey0]

Where did you lose them so far?

Did you put the greater and less than or equal to in the exam or just less than / greater than in that one i posted about?

2 lost in 3b, 2 lost in 4c and 1 in 5b so far. I cannot remember the signs I used in 8a, hopefully the right ones. It is only a 1 mark question though, so hopefully they 'round up'.

 

[mR sinister]

Question 4) part (a)

a= 2.3
r= 1.9

When you limiting sum = a/1-r

the answer is

- 4/3.

Also isnt the answer to question 7 a) ii
particle comes to rest at -e ? well thats what i got.


Also, just realized in question 8, it asks for the TIME AAHHRGGHH..
I got the correct answers hours wise.

but i forgot to add the hours to the time 5am. Zomg..

you guys think they will be bitchy and deduct a mark? i guess the hard part was to actually figure out the hours

 

[Currlz]

Nice, im looking at like 80-85/120 I guess...I kinda just fucked up stupid shit...idk.

 

[adamcg]

thanks OP, you = cool

Does anyone have a proof for 10 c) ii)?

I'm not sure my answer was sufficient...

still, if it is, 118 XDXD

 

[Thecorey0]

thanks OP, you = cool

Does anyone have a proof for 10 c) ii)?

I'm not sure my answer was sufficient...

still, if it is, 118 XDXD

Latex is not working.
g'(x) = 1/(1+x)
f'(x) = 1 - x + x^2
= x^3/(1+x) + 1/(1+x) - from c.i.
= (x^3 + 1)/(1+x)
>= g'(x) since x^3 + 1 >= 1 for x>=0

This is what I put, not sure if it is sufficient though.

 

[kachoo]

Question 4) part (a)

a= 2.3
r= 1.9

When you limiting sum = a/1-r

the answer is

- 4/3.

I have
a = 1.2
r = .9

so answer is 1.2/(1-.9) = 1.2/.1 = 12

a/1-r works when |r| < 1

 

[boxhunter91]

It didnt really make sense as to how it was 12. But yeh i got answer..

 

[mR sinister]

Argh.... my STUPID MISTAKE
not reading the question properly...

lol i went from an estimate of around 105 to 95.....

 

[johnny1991]

Ok Your answer to question 5 b) II and III are u sure....? i h8 probablity

 

[mitchwong650]

Question 4) part (a)

a= 2.3
r= 1.9

When you limiting sum = a/1-r

the answer is

-4/3

um, r was 0.9 not 1.9. you can't have a negative limiting sum. the answer is 12