-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Search results
-
Chemistry: Post your doubts here!
Are you sure? I thought that Mg + 2 H2O(l) --> Mg(OH)2 + H2 (slow) Mg + H2O(g) --> MgO + H2 (fast) -
Mathematics: Post your doubts here!
I see you haven't understood my answer through PM's. Anyways, the range won't change. -
-
Mathematics: Post your doubts here!
I solved that question as syed1995 asked for it a few pages back. Yes you're supposed to know that a convergent geometric sequence is a sequence that has a sum to infinity, this is available if the common ratio is less than 1 and greater than -1. -
Mathematics: Post your doubts here!
I did that one wrong :p I was supposed to replace with k-3 AND I did -5+4 = 9 :p It's 1:40 here, half asleep :D So the correct one would be to replace it with k-3 so... f^-1(x) = ±√(k-3+4-k) + 2 y - 2 = ±√(k-3+4-k) The two k's cancel each other y-2 = ±√(1) y - 2 = ±1 y = 3 or y = 1 The... -
Mathematics: Post your doubts here!
Yup, I had the same doubt, and got stuck there too.. But the ms had it pretty clearly explained, the range of f(x) is the domain of f^-1(x) In f^-1(x) --- x > k-4 f(x) = (x-2)^2 -4 + k Take it as if f^-1(x) is y and switch as always x = (y-2)^2 - 4 + k x+4-k = (y-2)^2 y-2 = ±√(x+4-k)... -
Mathematics: Post your doubts here!
Check above I already posted it... I'll try this one as well.. -
Mathematics: Post your doubts here!
syed1995 b) i) r = 1/3tan^2θ convergent means r < 1 1/3tan^2θ < 1 tan^2θ < 3 tanθ < √(3) θ < tan-1(√3) θ < 60 0 < θ < 60 Extra answer I came up with and proved right, but not in ms :) 180 < θ < 240 This answer because tan is valid in the third quadrant as well ;) -
Mathematics: Post your doubts here!
a) an = a1 + (n-1)d cos^2x = 1 +d d= cos^2x -1 Sn = 10/2[2(1) + (10-1)(cos^2x - 1)] Sn = 10/2[2(1) + 9(-sin^2x)] Sn = 5[ 2 - 9sin^2x] Sn = 10 - 45sin^2x a = 10 ... b = 45 -
Mathematics: Post your doubts here!
http://rechneronline.de/function-graphs/ -
A level Biology: Post your doubts here!
I think this topic has been removed from the syllabus. As I've never heard of this... EAR. -
Chemistry: Post your doubts here!
Your Duaa made my day. You're welcome :) -
Chemistry: Post your doubts here!
Dynamic equilibrium: A reversible reaction in which the rate of forward reaction is equal to the rate of backward reaction in a closed system, and there is no change in the concentration of reactants and products. Reversible reaction: A reaction that does not go to completion as the the... -
Mathematics: Post your doubts here!
You didn't tell me if you understood my explanation for your Mechanics question :D -
Mathematics: Post your doubts here!
I don't really understand the meaning of limits to be honest. -
Mathematics: Post your doubts here!
Alice123 Thanks 2325590381028302802 times. Jazaki Allahu Khairan :) Just one more request, I realize I've been a burden, sorry about that :( When do we add +c when integrating, and when not? -
Mathematics: Post your doubts here!
Ooooh, lol. Thank you very much, how about the other two questions? :D -
Mathematics: Post your doubts here!
Doesn't really make a difference. :unsure: Thank you for the help nonetheless. :) -
Mathematics: Post your doubts here!
http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_s12_qp_13.pdf Q4 ... i) Q7 ... i) Q8 ... i) If anyone could please explain these 3 questions. PhyZac syed1995 -
Chemistry: Post your doubts here!
Yes. For paper two you need to know the tests for cations and anions, as it comes occasionally where they show you a reaction and you have to write an observation. Specially the anions like Cl, F, Br, I.