AS math 9709/May June/2018/ Paper 12 Hard Or Easy?

[Bai fong]

waitt wasnt it k>11 and k<3??

oh yes im sry...for the trig question it was 7 + 4= 11 and -4 + 7 = 3

 

[mirolev]

I think I got wrong answer or incomplete answer where curve lies above x-axis.
Basically I found perfect square and then found k>9. Not sure, maybe that was the answer.

In another question where 2cosx + 3sinx > 0 I found x > 323 and x < 146 but I forgot about 0 < x < 360. Might lose 1 mark for that.

 

[muaz_ali]

provided it was lengthy, the threshold should be around 58.

 

[muaz_ali]

the product angle was 55 something.

 

[Bai fong]

the product angle was 55 something.

do you remember what you got for vector OC ?

 

[muaz_ali]

nope. but i think 55 is correct because looking at the slope of CAD, it felt like it.

 

[Bai fong]

nope. but i think 55 is correct because looking at the slope of CAD, it felt like it.

i remember getting 75 or 76 something

 

[Bai fong]

od = 2i + 4k
oa = 4i
ob = 5j

 

[Bai fong]

yes

I think I got wrong answer or incomplete answer where curve lies above x-axis.
Basically I found perfect square and then found k>9. Not sure, maybe that was the answer.

In another question where 2cosx + 3sinx > 0 I found x > 323 and x < 146 but I forgot about 0 < x < 360. Might lose 1 mark for that.

yes you didnt state the 0 and 360 limits

 

[Paula V]

the product angle was 55 something.

The angle was 34.7

 

[Paula V]

provided it was lengthy, the threshold should be around 58.

I hope it's that low, I don't think it will be higher than 60 anyways

 

[dwightedknight]

The answer to the volume question iss 32pi/3 or 108pi/3?

 

[mirolev]

The answer to the volume question iss 32pi/3 or 108pi/3?

32pi/3

 

[mirolev]

The angle was 34.7

I probably got the same answer.

 

[Pravin Hapugaswatta]

8

I still dont understand why n is not 13
In question they asked to find amount of salt of 12th week after change

I think 13 is correct because as i remember it stated "after the first week of change amount of salt produced was 8000kg" so technically here they are saying about the second week i guess..not sure though

 

[Paula V]

8

I think 13 is correct because as i remember it stated "after the first week of change amount of salt produced was 8000kg" so technically here they are saying about the second week i guess..not sure though

It said the first week after the change, so the first term wasn't the week of the change, it was the week after it, so the 12th week after the change is the 12th term

 

[Bai fong]

The angle was 34.7

do you remember what you got for oc?
This is probably why everyone is getting different answers, did you get 2i + 5j + 4k for OC?

 

[Paula V]

do you remember what you got for oc?
This is probably why everyone is getting different answers, did you get 2i + 5j + 4k for OC?

I think I got 6i-5j-4k

 

[Mohammad2018]

I much marks was for the sequence question

 

[Bai fong]

I think I got 6i-5j-4k

i remember getting that for AC lol