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  1. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Calculate the area of the 4 vertical faces. 2(20 * 4) + 2( 7*4) = 216 cm^2
  2. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Q = 5,6,7,8,9,10 Q' = 2,3,4 P = 2,3,5,7 We're writing P ∪ Q', so write ALL the elements in those 2 sets.
  3. D

    Maths, Addmaths and Statistics: Post your doubts here!

    2,3,4 are the numbers less than 5 (Q complement) 5,7 are prime numbers (set P) It's a union so write both.
  4. D

    Maths, Addmaths and Statistics: Post your doubts here!

    List elements of P (prime numbers) and all numbers less than 5.
  5. D

    Maths, Addmaths and Statistics: Post your doubts here!

    And what exactly do you think I did wrong?
  6. D

    Maths, Addmaths and Statistics: Post your doubts here!

    BA = 1.5 * OP Since height is same, area of triangle OBA = 1.5 * Area of OPA. So the ratio is 3/2. BC = AP. BC is 6 units right, 5 units up. Go 6 units right and 5 units up from A. P is at (10,9)
  7. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Draw the line y = -x + 1. Then reflect along that line.
  8. D

    Maths, Addmaths and Statistics: Post your doubts here!

    When it is correct to the nearest unit. For example, correct to the nearest kg.
  9. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Whatever it is nearest to, divide that by 2 to get the bounds. So the bound values of the box are 0.1/2 = ±.05 and for the container, they're 0.5/2 = ±0.25 You have to find the greatest possible mass, so use the + values of both bounds (each box is 1.55 kg and the container is 6.25 kg)
  10. D

    Maths, Addmaths and Statistics: Post your doubts here!

    AE is 5q + kp. 5q + kp = W(2p + q) 5q + kp = 2Wp + Wq compare coefficients of p and q 5 = W k = 2W k = 2(5) k = 10
  11. D

    Maths, Addmaths and Statistics: Post your doubts here!

    This is how you find y. 360 - 120- 53 - 40 = 147. Hopefully you can make sense out of that.
  12. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Try reading this http://www.bbc.co.uk/schools/gcsebitesize/maths/number/primefactorshirev1.shtml
  13. D

    Maths, Addmaths and Statistics: Post your doubts here!

    part a is solved above. b) Acceleration from t 0 to 20 = u/20 Deceleration = (u/20)/2 = u/40 a = (final velocity - initial velocity)/time - u/40 = (u/4 - u)/t -ut = 10u - 40u -ut = -30u t = 30 That's 30 seconds since deceleration started so total time = 60 + 30 = 90s
  14. D

    Maths, Addmaths and Statistics: Post your doubts here!

    0 = x^2 + x -12 solve to get 2 values for x. Negative one will be l and positive one will be m. For 24, draw a circle of radius 5 cm, center C then the angle bisector of B. P will be the point where the angle bisector cuts the circle inside the triangle.
  15. D

    Maths, Addmaths and Statistics: Post your doubts here!

    Nearest ten degrees = 10 Nearest tenTH of a degree = 1/10
  16. D

    Maths, Addmaths and Statistics: Post your doubts here!

    D = 0.5 * 20 * u = 10u 2D = 20u we already have 10u so we need to know the time by after which it travels another 10u from the graph, it's t = 30s ( area of rectangle = 10 * u)
  17. D

    Maths, Addmaths and Statistics: Post your doubts here!

    a) 4/(4+5) b) There are a total of 7 'units' (3+4). The unit of girls is 1 more than boys. That means 1 unit represents 120. 1 : 120 7 : x cross multiply and solve.
  18. D

    Biology; Chemistry; Physics: Post your doubts here!

    Maybe you thought it was asking for most energy.
  19. D

    Biology; Chemistry; Physics: Post your doubts here!

    Some of the students who receive a distinction do get 100%.
  20. D

    Biology; Chemistry; Physics: Post your doubts here!

    Perhaps. I can imagine the mark scheme reading "(simple) sugars"
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