-
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
-
Maths, Addmaths and Statistics: Post your doubts here!
Re: O'level Maths, Addmaths and Statistics help available he # Frequency Density = Frequency / class width = (6+9) / 3 cm(representing 15 Kg) = 15 / 3 = 5 cm # greatest difference between the number of patients is around waiting time 10 min- soumayya
- Post #463
- Forum: O-Levels / GCSEs / IGCSE
-
Maths, Addmaths and Statistics: Post your doubts here!
Re: O'level Maths, Addmaths and Statistics help available he Frequency Density = Frequency / class width = (6+9) / 3 cm(representing 15 Kg) = 15 / 3 = 5 cm- soumayya
- Post #462
- Forum: O-Levels / GCSEs / IGCSE
-
Maths, Addmaths and Statistics: Post your doubts here!
Re: P (either A or B) = P(A) + P(B) - P(A intersection B) = 0.3 + 0.6 - 0.18 = 0.72 P (both A and B) = P( A intersection B ) = 0.18 P (either A or B but not both occurs) = 0.72 - 0.18 = 0.54- soumayya
- Post #461
- Forum: O-Levels / GCSEs / IGCSE
-
-
Chemistry MCQ thread...
After burning, there will be 20 cm3 of oxygen (since it is in xs), 10 cm3 of CO2 and 20 cm3 of SO2. Total = 50 cm3 of gas After treatment with NaOH, there will be only 20 cm3 of oxygen (both CO2 and SO2 will react with NaOH, both being acidic gases)... so, the answer is C... Hpe zat hlpss... -
-
MAths P1 Trigonometry help!
tan^2 x − sin^2 x ≡ tan^2 x sin^2 x L.H.S: tan^2 x − sin^2 x = sin^2 x /cos^2 x - sin^2 x = [sin^2 x - sin^2 x cos^2 x]/ cos^2 x = [sin^2 x (1 - cos^2 x)] / cos^2 x = [sin^2 x * sin^2 x ] / cos^2 x... -
Mathematics
^A^E^I^O^U^ where ^ are possible places for placing a consonant... there are 5 consonants...and 6 places... so i would go for 6P5 =720 hpe zat hlps... -
Chemistry 2006
-----------ethanol + ethanoic acid = ethyl ethanoate + water Initially------1 M---------1 M --------------- 0------------0 At equi ----(1-x) M-----(1-x) M------------ x M---------- x M kc = x^2 / (1-x)^2 = 4 (x / 1-x )^ 2 = 4 x / 1-x =2 x = 2 - 2x 3x = 2 x = 2/3 -
Winners of XtremePapers Contest 2010-2011 C O N G R A T S!!
Re: Winners of XtremePapers Contest 2010-2011 C O N G R A T congratzzzz...- soumayya
- Post #7
- Forum: Announcements
-
help chem mcqs....
i fink the ans to 37 is 1, 2 n 3...all 3 seem logical... -
As level MATH QUESTION. NEED GUIDANCE
y = x^3 - 3x dy/dx = 3x^2 - 3 When x=2, dy/dx = 9 δy/δx ≈ dy/dx δy ≈ 9p -
As level MATH QUESTION. NEED GUIDANCE
A = 50, dx/dt = 0.2, x = 5 let the other side of the rectangle be y... Area of rectangle = x * y 50 = xy y = 50/x dy/dx = -50/(x^2) When x =5, dy/dx = -2 dy/dt = dy/dx * dx/dt dy/dt = -2 * 0.2 = -0.4 rate of decrease = 0.4 Hpe zat hlps... -
mathematics
360 = 2^3 * 3^2 * 5 Since 360k is a cube number, 360k = 2^3 * 3^3 * 5^3 Comparing 360k wiz 360, k = 3 * 5^2 = 75 Hpe zat hlps...- soumayya
- Post #4
- Forum: O-Levels / GCSEs / IGCSE
-
Chemistry paper 5
For dilution problems, u need to use the formula M1V1 = M2V2, where M1= initial conc, V1= volume of solution to be used, M2= conc. required n V2= volume required. For example, if we want to prepare solns wiz conc 0.0 , 0.5 , 1.0 , 1.5 n 2.0 mol/dm^3. Preparing 10 cm^3 of 0.5 mol/dm^3 NaCl... -
need help on CHEM mCqS
hmm...yh it's C...i didn't draw the full structural formula...hence i failed to spot the isomers... -
Mathematics: Post your doubts here!
Re: Maths made easy =) stuck sumwhere?Ask ur doubts here!! wat type of inequalities...???- soumayya
- Post #224
- Forum: O-Levels / GCSEs / IGCSE
-
-
******Biology Doubts!!!!****
they are the proteins that are manufactured inside cells..