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GCSE Maths Edexcel Calculator Paper - Exchange your help! - 09/06/16

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Reply 20
Mathswatch are streaming their videos on youtube after it kept crashing before paper one.
Here is the link: https://www.youtube.com/user/MathsWatch/playlists
So even if your school doesn't have access you can now, they are useful.
Original post by B3ASTy
John invested £2500 for 2 years in a savings account.
He was paid 3% per annum compound interest.

How much did John have in his savings account after 2 years? REMEMBER THE EQUATION FOR THIS ONE.


£2652.25
Reply 22
Original post by gabsdl
i think so...


someone sent me a mark scheme for this so i now know 100% it's right :wink: https://www.flickr.com/photos/142557413@N08/27474230551/in/album-72157668628483140/lightbox/
Reply 23
Original post by B3ASTy
someone sent me a mark scheme for this so i now know 100% it's right :wink: https://www.flickr.com/photos/142557413@N08/27474230551/in/album-72157668628483140/lightbox/


ah that's good, wasn't 100% sure sorry :colondollar:
Original post by B3ASTy
John invested £2500 for 2 years in a savings account.
He was paid 3% per annum compound interest.

How much did John have in his savings account after 2 years? REMEMBER THE EQUATION FOR THIS ONE.


What's the equation?
Reply 25
Original post by hafsa473
What's the equation?

His final amount= original amount x multiplier^years
Reply 26
Original post by hafsa473
What's the equation?


so final amount= 2500 x 1.032
Original post by B3ASTy
Prove that (5n+1)^2 - (5n-1)^2 is an even number, for all positive integer values of n.


Wait, this is a GCSE maths paper?! We do proof by induction in the further maths pure AS module!
Original post by B3ASTy
so final amount= 2500 x 1.032


Oh ok I forgot so thanks
Reply 29
Original post by goatygoat
Wait, this is a GCSE maths paper?! We do proof by induction in the further maths pure AS module!


That specific question is in the pixl predicted paper
Original post by B3ASTy
That specific question is in the pixl predicted paper


Oh okay, so it must like an extension paper then?. Honestly though, if you can prove that without being taught it in class (I don't know if the syllabus has changed since I've done it) then you're a G at maths dawg.
WIN_20160608_21_06_29_Pro.jpg
Original post by B3ASTy
Prove that (5n+1)^2 - (5n-1)^2 is an even number, for all positive integer values of n.


Answer!
Reply 32
Original post by superjay39
WIN_20160608_21_06_29_Pro.jpg

Answer!


Thanks for this, it seems easier than it first looks!
Capture.PNGTo do this;

Ac^2 = 5^2+3^2
Ac^2 = 25+9
AC^2 = √34
-------------------
Tan(x) = 5/3
x = Tan^-1 (5/3)
= 59.03624347°
sin (59.0) = opp(80)/3

BD= 3sin (59.0)
=2.57247877
3+5+√34+2.57247877 = 16.4 (ANSWER)

PM for more :smile: I AM SOO SCARED FOR TOMORROW :smile: AIMING FOR A* xD
maths Q.JPGHow would I do this question?
Original post by hafsa473
maths Q.JPGHow would I do this question?



Sector
40/360 x π (8)^2
=22.34021443cm^2

Triangle
1/2(8)(8)sin40
=20.56920351cm^2

Shaded Area = Sector - Triangle = 1.7710109cm^2 = 1.77 (3sf)
solve 3x^2-5x-1=0
give your solutions correct to 3 significant figures

I know it's easy, but I don't want to give you hard questions to stress you out before tomorrow haha
Original post by Marshall Taylor
solve 3x^2-5x-1=0
give your solutions correct to 3 significant figures

I know it's easy, but I don't want to give you hard questions to stress you out before tomorrow haha


Quadratic formula, punch your numbers in, watch for minuses and then get your two answers. I would give the actual answer but I really can't be bothered to get my calculator.
WP_20160608_21_54_30_Pro.jpg Anyone wanna have a go at this?
Reply 39
Original post by B3ASTy
Thanks for this, it seems easier than it first looks!

no it is 20n which you need to factorise to give you 2(10n)

i answered the question when you first posted it, i am not sure if you saw it

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