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  1. Question: Trig proof

    by kristo
    Answers
    3
    Views
    970

    Yes, the angles were restricted to the first...

    Yes, the angles were restricted to the first quadrant, forgot to add it in the first post, sorry!
    Thanks for your help, I got it now :).
  2. Question: Trig proof

    by kristo
    Answers
    3
    Views
    970

    trig proof

    Hey, how do I prove this inequality?
    sin(a+b)<sin a + sin b
    If I write out the sin(a+b) I get this:
    sin a cos b + sin b cos a - sin a - sin b<0
    But I got no idea, what to do next.
    Any help...
  3. Answers
    0
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    292

    Some geometry stuff

    I'm supposed to find the blue colored surface area in both tasks.

    1 The radii of the circles are 3 cm and 1 cm, I have no idea what to do here lol.. ...
  4. Answers
    4
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    1,211

    .. what?

    .. what?
  5. Question: Maths

    by kristo
    Answers
    3
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    3,096

    Let's make a quadratic function of this, x being...

    Let's make a quadratic function of this, x being the number of bottles sold. Money he gets from selling wine is price per bottle*bottles sold.
    f(x)=5*10000 + x(5-0,0002x)
    f(x)=-0,0002x^2 + 5x +...
  6. Question: I need a few tips

    by kristo
    Answers
    1
    Views
    1,295

    I need a few tips

    Here's the problem:
    A bicycler and a car driver started driving towards each other from towns A and B.
    After they had drove for an hour the car driver sped up by 20 km/h. If the car wouldn't have...
  7. Answers
    7
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    1,813

    I think I got it now. \frac{sqrt{a+x}+...

    I think I got it now.

    \frac{sqrt{a+x}+ sqrt{a-x}}{sqrt{a+x}-sqrt{a-x}}=sqrt{b}
    First I multiply both sides by sqrt{a+x} - sqrt{a-x} \\
    Then I get sqrt{a+x}+sqrt{a-x}=...
  8. Answers
    7
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    1,813

    You're fast lol, I just noticed the mistake and...

    You're fast lol, I just noticed the mistake and was going to edit my post
    I'll try to do it again, going to post later if I get the solution.
  9. Answers
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    1,813

    Thanks a lot Galactus, I've solved some of the...

    Thanks a lot Galactus, I've solved some of the equations now, still need help with others.

    \frac{sqrt{a+x}+ sqrt{a-x}}{sqrt{a+x}-sqrt{a-x}}=sqrt{b}
    First I divide both sides by sqrt{a+x} -...
  10. Answers
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    1,813

    Some root equations

    Hey, I need some help with solving x for these equations:
    1 x^2-4x+6=sqrt{2x^2-8x+12}


    2 \frac{x}{x+1} -2 \frac sqrt{x+1}sqrt{x}=3


    3 \frac{sqrt x + \sqrt[3]x}{sqrt x - \sqrt[3]x}=3
  11. Question: Factor Completely

    by kristo
    Answers
    3
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    2,154

    (a^2-b^2) = (a-b)(a+b) ye

    (a^2-b^2) = (a-b)(a+b)
    ye
  12. Question: A word problem

    by kristo
    Answers
    3
    Views
    3,731

    Okie, thanks a lot Capuchin ;)

    Okie, thanks a lot Capuchin ;)
  13. Question: A word problem

    by kristo
    Answers
    3
    Views
    3,731

    A word problem

    A pool is filled by two pipes. It takes the first pipe 2 hours more and the second pipe 4 hours more to fill it than both pipes at the same time.
    The book says that the first pipe fills the pool in...
  14. Question: A word proble m

    by kristo
    Answers
    7
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    1,204

    S being the distance person A walked until...

    S being the distance person A walked until meeting.
    The distance between town A and B is s + s + 6 which is 30km.
  15. Question: A word proble m

    by kristo
    Answers
    7
    Views
    1,204

    I think I solved it.. \{...

    I think I solved it..
    \{ \frac{s}{v_1}=\frac{s+6}{v_2} \\ \frac{s}{v_2}=4 \\ \frac{s+6}{v_1}=9
    Which solves for s=12, v1=2, v2=3
  16. Question: A word proble m

    by kristo
    Answers
    7
    Views
    1,204

    No, they are starting from different towns,...

    No, they are starting from different towns, person A from town A is going to town B and person B from town B going to town A, they meet on the way.
    So person A arrived at town B 4 hours after...
  17. Question: A word proble m

    by kristo
    Answers
    7
    Views
    1,204

    A word proble m

    Here it is:
    Two persons started moving towards the other town at the same time, when they met, one person had walked 6 kilometers more than other person. After meeting they continued walking towards...
  18. Question: Angles

    by kristo
    Answers
    3
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    3,985

    Thanks a lot ;)

    Thanks a lot ;)
  19. Question: Angles

    by kristo
    Answers
    3
    Views
    3,985

    Angles

    How do I find the angles x and y here?
    http://img338.imageshack.us/img338/2773/matenurk001vz2.jpg
  20. Answers
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    1,138

    Thanks for your help, here's some cookies...

    Thanks for your help, here's some cookies ;)
  21. Answers
    2
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    1,138

    Trigonometry, simplifying

    How do I simplify this?
    1-2sin a * cos a
    free cookies for anyone who helps!
  22. Question: A thingy

    by kristo
    Answers
    4
    Views
    1,028

    So it's (x-y)(x+y) and after replacing...

    So it's (x-y)(x+y) and after replacing (a^2-b^2)(a^2+b^2)?
    Thanks a lot, appreciate it!
  23. Question: A thingy

    by kristo
    Answers
    4
    Views
    1,028

    A thingy

    I need help with solving this one.. How do I factor the a^4-b^4?
    \frac{a^4-b^4}{4a^2+4b^2} : (a+b)
  24. Question: An equation

    by kristo
    Answers
    13
    Views
    2,287

    This is the exercise: Find two numbers, if...

    This is the exercise:
    Find two numbers, if multiplied they equal 3 times their sum; sum of both numbers squared is 160.
    I hope I worded it correctly.

    Oh and I go to 9th grade, so it's primary...
  25. Question: An equation

    by kristo
    Answers
    13
    Views
    2,287

    Well, let's keep practicing then :D Or not.....

    Well, let's keep practicing then :D

    Or not.. lol

    I tried it your way asterisk, but got stuck again.
    Got this far:

    (\frac{3y}{y-3})^2+y^2=160 \\
    \\
    \frac{9y^2}{y^2-6y+9}+y^2=160 \mid...
  26. Question: An equation

    by kristo
    Answers
    13
    Views
    2,287

    Thanks a lot, I think I'll be able to do it now :)

    Thanks a lot, I think I'll be able to do it now :)
  27. Question: An equation

    by kristo
    Answers
    13
    Views
    2,287

    What are you talking about?:confused: lol Did...

    What are you talking about?:confused: lol

    Did it in latex now, I tried to do it before, but forgot to add the math tags lol.
    Oh and yeah, they're supposed to be simultaneous.
  28. Question: An equation

    by kristo
    Answers
    13
    Views
    2,287

    An equation

    \left\{x*y=3x+3y\\x^2+y^2=160} \right\ \\

    x=(\frac{3x+3y}{y}) \\

    (\frac{3x+3y}{y})^2 +y^2=160 \\

    \frac{9x^2+18xy+9y^2}{y^2}+y^2=160 \mid *y^2 \\
    9x^2+18xy+9y^2+y^4=160y^2
  29. Question: 2 maths exercises

    by kristo
    Answers
    3
    Views
    1,876

    Thanks! So is it 12h for the first one and 1.5h...

    Thanks!
    So is it 12h for the first one and 1.5h for the 2nd exercise?
  30. Question: 2 maths exercises

    by kristo
    Answers
    3
    Views
    1,876

    2 maths exercises

    1. A pipe fills a pool in 4 hours, another pipe drains a full pool in 6 hours. How long will it take to fill the pool if both pipes are opened?

    2. A pool is connected with 3 pipes. Two pipes fill...
  31. Answers
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    Okie, thanks a lot :).

    Okie, thanks a lot :).
  32. Answers
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    1,357

    Anyone please?

    Anyone please?
  33. Answers
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    1,357

    Some geometry stuff

    A trapezoid's parallel sides are 8 decimeters and 18dm, the other sides are 8.1dm and 5dm.
    How do I find surface area and height of the trapezoid? We're studying trigonometry at the moment, but I...
  34. Question: Some physics stuff

    by kristo
    Answers
    2
    Views
    928

    Water can be 0C without turning into ice. Still...

    Water can be 0C without turning into ice.
    Still help needed!
  35. Question: Some physics stuff

    by kristo
    Answers
    2
    Views
    928

    Some physics stuff

    I need help with 2 exercises.

    Quarter of whole work was done with a machine, which' power is 4kW,
    then a new machine was taken into use.
    The whole work was done with 6kW power.
    1. What was...
  36. Question: Balancing a bar

    by kristo
    Answers
    9
    Views
    1,083

    I think I got it now, thank you :). Sorry about...

    I think I got it now, thank you :).
    Sorry about the half comment, accidentally pressed F5 while writing it and can't edit.
  37. Question: Balancing a bar

    by kristo
    Answers
    9
    Views
    1,083

    I understand it for most of the part, but could...

    I understand it for most of the part, but could you explain the x/2 and x/6 part a bit?
  38. Question: Balancing a bar

    by kristo
    Answers
    9
    Views
    1,083

    So, x is about 1.5 meters, right?

    So, x is about 1.5 meters, right?
  39. Question: Balancing a bar

    by kristo
    Answers
    9
    Views
    1,083

    Thanks a lot for your help! I get this far, but...

    Thanks a lot for your help!
    I get this far, but don't really know what to do next, a little help, please?
    http://img68.imageshack.us/img68/2365/geilord9kl.gif
  40. Question: Balancing a bar

    by kristo
    Answers
    9
    Views
    1,083

    Balancing a bar

    On one end of a 6m bar there is a 600kg weight, on the other end there's a 200kg weight, the bar itself weighs 20kg.
    Where shall the point of support be so that the bar is balanced?

    I hope you...
  41. Answers
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    3,363

    So Fe is reductant, as he loses 3 electrons?

    So Fe is reductant, as he loses 3 electrons?
  42. Answers
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    3,363

    Oxidation, reduction

    Fe2O3 + 3H2 -> 2Fe + 3H2O

    Which materials are reductants, which are oxidants?
    Please explain the solution, too. Any help is appreciated :).
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