The Trial and Improvement answer I got was 3.7 and here is how:

3.8^3 - 5 x 3.8 = 35.872
3.7^3 - 5 x 3.7 = 32.153

35.872 - 34 = 1.872
34 - 32.153 = 1.847

1.847 < 1.872

Therefore 3.7 is the correct answer!?

Another point is that I got 80.1 instead of 80.4 in the last question however I believe this is because I rounded the result of the first stage to 40. Hopefully I will still get 4 or 5 out of 6 for doing the correct working.

Reply 1726

Willls

whats the grade boundries going to be? High or Low?

Reply 1727

TikkaCake

i became confused with the wording as i thought it said finding the "angel" not angle,
So i simply put... Im not on that "side" yet

Reply 1728

femzz15

Original post by jtb135

95 - 102 marks

no it is not. thats for a B grade. for a C it is 65-68 marks

Reply 1729

Mathsteacherwess

November 2015 hardest paper yet and grade boundaries similar to other years - it really can't be guessed as you are being compared to each other!

Original post by ad4m

There is no way of telling if June 2015 was harder than June 2016 until Edexcel collect everyones marks and compare them to the statistics of last year. In terms of June 2015 being considered the worse exam ever, it wasn't. I believe that title goes to Nov 2012. But again that's just opinion. Believe it or not, with the grade boundaries quite low for A* at 155, only 5% of people managed to get this mark or higher. Therefore, if you perform in the top 5% of the cohort you are likely to get an A*. A* could potentially be 190/200 if 5/10% of students get this. You never know until the results are published. Personally, from sitting the exam in June 2015, November 2015 and June 2016 I can say that I personally found the noncalc of Nov 2015 the hardest due to the vast amount of proof questions (about 10 marks overall). And many people were bothered about the June 2015 sweets question, but that had come up before in other areas of mathematics.

Reply 1730

Meegan543210

Original post by Willls

whats the grade boundries going to be? High or Low?

Probably high?

Reply 1731

jtb135

Original post by femzz15

no it is not. thats for a B grade. for a C it is 65-68 marks

Apologies, for some reason I put the B

Reply 1732

nattyboyg

Original post by epage

For the trial and improvement one my few ids were saying they got 3.7 but I got 3.8 and I was 100% sure that was right?

Posted from TSR Mobile

Yes it got 3.8 because it was over 3.75

Reply 1733

vj r

Original post by robishere

That is wrong because if you use 3.75 the answer is too low and because you need to round final answer to 1d.p it has to be 3.8

Reply 1734

Edgerulezs

Original post by 34908seikj

No, it was a lot easier.

Okarin ignored Mayushii's tuturuuu :frown:

Reply 1735

DrPepper123

Original post by Benb2000

I got 80.4 but don think it's right

Knowing 1/2absinC= 18cm (squared)...
1/2 x 7 x 8 x sinC= 18
18/28= sinC
sin-1(18/28)= 40.00520088

Now use the cosine rule:

7²+8²-(2 x 7 x 8 x cos(40.00520088)) =27.20955764

Then square rooting it gives…
5.216278141

Then use the sine rule…

(Sin(40.00520088) / 5.216278141) x 8 = 0.9859246389

Sin-1(0.9859246389)= 80.4 (to 3 sig. Figures)

If anyone believes this method to be incorrect reply to this.

(edited 7 years ago)

Reply 1736

jtb135

Original post by robishere

I'm one of the few people in agreement with this 3.7 method, and yes, you should get 4/5 marks for the working

Reply 1737

jtb135

Original post by vj r

That is wrong because if you use 3.75 the answer is too low and because you need to round final answer to 1d.p it has to be 3.8

However, this shows 3.8 being 0.025 further away than 3.7. 3.7 is closer.Therefore, the answer is 3.7, even though 3.75 gives an answer smaller than 34.