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  1. C

    Impossible integral

    Nah that seems pretty simple
  2. C

    Jrahs q9

    Nah that's my crappy drawing, sorry. It's all good, it's been solved.
  3. C

    Jrahs q9

    Oh thanks so much for the edit I got so shit scared. I worked it out another 2 ways and got the same answer lol, I thought I forgot how to geometry.
  4. C

    Jrahs q9

    The only thing I can come up with is maybe your diagram should look like this: http://m.imgur.com/XRuutkk
  5. C

    Jrahs q9

    http://m.imgur.com/nZr8r5U The picture didn't really have the best explanation. So as we have y+y+2y+5y=9y circumference, we can divide 360° by 9 to find the angle for each y. 360/9=40°. So we can calculate what angle each of the arcs form. The two y arcs form 40° and the 2y arc forms 80°, so...
  7. C

    Jrahs q9

    60° I'll post a picture soon
  8. C

    Inequalities

    The second question would be B. We can see that the y values of the shaded region are higher than y=0, and higher than y=4+4x. Also, all of the y-values are lower than y=(x-2)^2, so the answer is B,
  9. C

    Another graph question

    Yeah, thats why I said C.
  10. C

    Quick question

    But when you do it to 5 decimal places instead of 3: And that's what I get on my calculator as well
  11. C

    Another graph question

    It isn't given that the coordinate is (2,3), so you can't use it. Just look at it and C will be the only one that makes sense. But I agree the graph is off because subbing a, b and c for x=2 will get (2,4) which is clearly not right.
  13. C

    Another graph question

    There's no option for a=-1. And you don't really have to do any working out for this one. So here is my method You see the hyperbola has a negative a because it is in the 2nd and 4th "quadrants" formed by it's asymptotes. B will be -3, as x cannot be 3, and similarly c will be 2 as y cannot be...
  14. C

    Concavity question

    That's what I got as well, so I'm assuming it's right.
  15. C

    Area of a triangle question

    Well look at triangles AEB and CDE. Though they have a vertically opposite angle, they are similar. And using the sides in proportion rule, the ratio of side is 1:3 for AEB:CDE sides. So let AE = x and the DE will be 4-x. Using the ratio of sides, we get: x/(4-x)=1/3 3x=4-x 4x=4 x=1 So we know...
  16. C

    Best Estimators

    Nah I'm the best, I use a quantum computer to generate estimates.
  17. C

    atar estimation.

    We need more info than that man, put up your ranks and school rank, then you'll get much better replies.
  19. C

    Test and compare your internet speed

    Nah, I live semi-rural, so everybody's internet here is crap.
  20. C

    Solving trig. functions

    Are you looking for angles greater than 360? Well add 360 to them, to get x = 390 and x = 510. Also have you learnt general solutions. I don't know whether they are 2 unit or 3 unit but they are useful in calculating angles greater than 360 and less than 0.
  21. C

    Solving trig. functions

    So is it that you don't know how to get angles greater than 360? If so, what you do is instead of starting at 0 degrees, as you normally do, you can start at 360 degrees. Or you could get the basic angles you need, in this case 90 and 270, and then add 360 degrees to them, to get 450 and 630. If...
  22. C

    Solving trig. functions

    Well for this question, cos((pi/4)t)=0. When cos(x) is 0, x is pi/2, 3pi/2, 5pi/2 etc. So when solving cos((pi/4)t)=0, we need (pi/4)t to be equal to pi/2, 3pi/2, 5pi/2, and 7pi/2, as I'm guessing the domain was restricted. So then we solve for t to get t=2, 6, and 10.
  23. C

    The Football Thread

    Real Madrid are first! Hoping this will be the case at the end of the season.
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