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# OCR (non mei) C4 Friday 24th June 2016 Watch

1. C4 is easy. Can't wait to smash this exam
2. (Original post by klosovic)
Just did it too, could not do 10(i) at all!! (apart from the first easy mark).

Now trying to work out how to do it...
I'm on that Q too rn. Gosh, the mark scheme, wth? This paper was utter shambles. Calamity to my head. This paper was awful.

3. Could anyone explain how to do this question please?
4. (Original post by klosovic)

Could anyone explain how to do this question please?
Find the ratio between r and h, given by initial conditions, then sub that in for r and find dv/dh then we know that dv/dt is -1/100 then using chain rule find dh/dt

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5. How the hell do you do the Differential Equation in June 2014 Q 10?!

I thought this chapter was easy! Damn.

6. (Original post by 16characterlimit)
How the hell do you do the Differential Equation in June 2014 Q 10?!

I thought this chapter was easy! Damn.

It was a poo Q truss. When you see the mark scheme, you'll be like ohhh
7. How do you do the Binomial questions when you estimate the value of something, like June 2013 10ii?
8. (Original post by 16characterlimit)
How do you do the Binomial questions when you estimate the value of something, like June 2013 10ii?
No idea but I think it's usually 0.1, but there must be a method to know which number to put in?
9. You basically find a value of X to sub in to make the given value, then sub that value of x into the binomial.

Are the people wanting the diff equation explainef still around?
10. (Original post by tavtavtav)
You basically find a value of X to sub in to make the given value, then sub that value of x into the binomial.

Are the people wanting the diff equation explainef still around?
How can you sub it in if theres a non binomial part?
11. (Original post by tavtavtav)
You basically find a value of X to sub in to make the given value, then sub that value of x into the binomial.

Are the people wanting the diff equation explainef still around?
12. Hopefully, it'll be a good exam, i hope
13. Anyone help with the binomial estimation questions?

14. I hope this helps guys. Quote me if you need more.

Edit: that V in the top left should be a dv. And the rate of change is negative. But forgive me, im tired.
15. (Original post by 16characterlimit)
How can you sub it in if theres a non binomial part?
Can you give an example?
16. (Original post by tavtavtav)
Can you give an example?
http://www.ocr.org.uk/Images/175260-...hematics-4.pdf

10 ii
17. You have x/(1-x)^3

Find a value of x that gives you whatever you need to prove, then sub that same value into the binomial.

First of all you know that that value must be between -1 and 1, as well as positive.
18. (Original post by tavtavtav)
You have x/(1-x)^3

Find a value of x that gives you whatever you need to prove, then sub that same value into the binomial.

First of all you know that that value must be between -1 and 1, as well as positive.
Is there no better/algebraic method other than educated guesses?
19. (Original post by 16characterlimit)
Is there no better/algebraic method other than educated guesses?
I believe No unless you want to solve x/(1-x)^3 =729/100.

Though i just did solved it on my silver calculator.

Try to think what to the power of 3 = 729 (for the bottom of the fraction)

This happens to be 9 - then try to make a multiple of 9 at the bottom. (0.9)
20. (Original post by tavtavtav)
I believe No unless you want to solve x/(1-x)^3 =729/100.

Though i just did solved it on my silver calculator.
Alright thanks.

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