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(i)substitute value of x and y in the implicit equation (ii) differentiate this implicit equation and equate it to -6 and simplify to get eqn in temrs of k and c use eqn in (i) and this eqantion to solve for k and c.

Yes by looking at arrow. It took 92 energy from s to u, so -92 from u to s. Get it? :P

Just follow the direction. 1. U to S + S to R = U to R = -92 + 134 = 42 2. T to S = T to U + U to S = -75 - 92 = exothermic. 3. R to T = R to S + S to U + U to T = -134 + 92 + 75 = 33. Only 1 is correct. THus D.

Agreed!

Welcome. :)

If u are learning CIE, till I know, i didnt come across any different things, may be if u learned some other board and appearing CIE A levels, till i know they do accept, as this is what sir said to me, thought its not in ms, but answers equivallent is considered. Wait for others to reply u. :)

https://www.facebook.com/groups/mathsrevision.examsolutions/ I am sorry, i have forgotten this thing completely xD Though post ur doubt there, in the link, hope so u get enough help :)

https://www.xtremepapers.com/community/threads/a-level-psychology-sociology-help.32260/#post-837731 The one who upload notes, ask for more help from him/her. Here we can only hep for physics though.

https://uk.answers.yahoo.com/question/index?qid=20090301083744AABmXz9

oxidation number of hydrogen is +1. There are 3 hydrogen molecules so we multiply 3 with +1 and so with 4 molecules of hydrogen 4(+1) So oxidation number is unchanged of hydrogen

Here you go ;)...

Nice thought. Upload more.

https://www.8mundo.com/post/mathematics-9709-paper-3-working-solutions-for-past-papers-6563399

https://www.xtremepapers.com/community/threads/chemistry-post-your-doubts-here.9859/page-371#post-736866

(y)

Thanks for the follow. xD

WHat is so personal there? You just want to study right? :P what wrong with XPC privacy? :P

When we have XPC, why to use other things to study? xD

Y not use XPC?