Exam-Specific Questions

[cosine]

I don't feel right posting the massive exam questions on the 3/4 question thread, so I'll post my queries here and if anyone could help, I would greatly appreciate your time and efforts.

[cosine]

How can I do 2b?

[cosine]

For x=0, y=1

But because the question says to list answers to two decimal places, do we have to say y=1.00? So would y=1 not gain the mark?

[cosine]

For the question attached, I worked with decimals the whole way but the assesors report had their answers in fractions, why? Would my decimal answers suffice? (They don't even say what form to answer in..)

Also, because of my continuous use of decimals for this question, I found it incredibly impossible to answer b iii and iv but the assessors report had it simply in fractions and were easily able to find the answer. My main question for this is, when do we know it is more appropiate and useful to use fractions over decimals? And vice versa? I always seem to lose marks on stuff like this, and because my methods teacher is completely useless, all I have is AN and I hope someone can assist me with this.

Many thanks

[Orb]

For the question attached, I worked with decimals the whole way but the assesors report had their answers in fractions, why? Would my decimal answers suffice? (They don't even say what form to answer in..)

Also, because of my continuous use of decimals for this question, I found it incredibly impossible to answer b iii and iv but the assessors report had it simply in fractions and were easily able to find the answer. My main question for this is, when do we know it is more appropiate and useful to use fractions over decimals? And vice versa? I always seem to lose marks on stuff like this, and because my methods teacher is completely useless, all I have is AN and I hope someone can assist me with this.

Many thanks

VCAA will always tell you whether to express it in exact form or to how many decimal places. Don't worry about it

[cosine]

VCAA will always tell you whether to express it in exact form or to how many decimal places. Don't worry about it

Thank you for the reply hamo94, but for my above question, the use of decimals would not lead to the correct answer, honesty. You can even try it for yourself, the assessors report use fractions, which (i converted on my calc) equal to the same decimals I had. But their fractions were able to simplify and get a nice answer, whereas I left mine in a really messy and not equivalent form... Just a bit confused, why did the assessors report use fractions? How could I have known to use fractions? (in this example, they did not specify whether they want decimals or fractions, hence my confusion..) This is 2006 VCAA exam 2.

Many thanks

[pi]

You should always use fractions (or decimal equivalent, I'm talking like 15 decimal places or something haha) for all intermediate steps in a problem. I personally used fractions on my CAS for the whole way until the last step if it asked for decimal points. Even if the fraction is ugly, it will only take a few extra seconds to write it down.

[keltingmeith]

Thank you for the reply hamo94, but for my above question, the use of decimals would not lead to the correct answer, honesty. You can even try it for yourself, the assessors report use fractions, which (i converted on my calc) equal to the same decimals I had. But their fractions were able to simplify and get a nice answer, whereas I left mine in a really messy and not equivalent form... Just a bit confused, why did the assessors report use fractions? How could I have known to use fractions? (in this example, they did not specify whether they want decimals or fractions, hence my confusion..) This is 2006 VCAA exam 2.

Many thanks

Either or should've worked. If using decimals for you the wrong way, you need to work on your converting ability. Or, as pi suggested, just use fractions.

[cosine]

Either or should've worked. If using decimals for you the wrong way, you need to work on your converting ability. Or, as pi suggested, just use fractions.

Thank you for the feedback, that is something new I learnt, try to use fractions over decimals and I will upload my answers tomorrow for that specific question tomorrow so we can see what I am doing wrong...

Also, if it says to two decimal places, and the answer is a whole number like 1, do we need to state 1.00 or would simply 1 suffice?

[IndefatigableLover]

Thank you for the feedback, that is something new I learnt, try to use fractions over decimals and I will upload my answers tomorrow for that specific question tomorrow so we can see what I am doing wrong...

Also, if it says to two decimal places, and the answer is a whole number like 1, do we need to state 1.00 or would simply 1 suffice?

You'll get zero if you don't specify to the number of decimal places needed so yes do state it as 1.00 rather than 1 if it is to two decimal places.

[cosine]

For question 4 of above, the train question: I was working with decimals and so all my answers leading up would use the same decimals:

4bii). q =

4biii).

I sub in q= to get:



Can someone, using my value of q please solve this for me? (Find a in terms of p)

[cosine]

For question 4 of above, the train question: I was working with decimals and so all my answers leading up would use the same decimals:

4bii). q =

4biii).

I sub in q= to get:



Can someone, using my value of q please solve this for me? (Find a in terms of p)

Haha can anyone answer me?

[cosine]

Guys this isn't an overly hard question, but I actually cannot seem to get the solution as exact value on my calculator, it always comes in as decimals... Im not sure why, any assistance is greatly appreciated.

[cosine]

Guys this isn't an overly hard question, but I actually cannot seem to get the solution as exact value on my calculator, it always comes in as decimals... Im not sure why, any assistance is greatly appreciated.

Can someone reply, please..?

[bills]

Can someone reply, please..?

Seems fine to me. What calculator are you using?