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  1. Question: Vectors Maths

    by corrigan
    Answers
    4
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    532

    A few things we will need: ...

    A few things we will need:

    x(t)=t-\frac{t^3}{3} \Rightarrow \frac{dx}{dt}=1-t^2 \Rightarrow \frac{d^2x}{dt^2}= -2t

    y(t)=t^2 \Rightarrow \frac{dy}{dt}=2t \Rightarrow \frac{d^2y}{dt^2}= 2
    ...
  2. Question: Vectors Maths

    by corrigan
    Answers
    4
    Views
    532

    okay, we have x(t)=t-\frac{t^3}{3}...

    okay, we have

    x(t)=t-\frac{t^3}{3} \Rightarrow \frac{dx}{dt}=1-t^2

    y(t)=t^2 \Rightarrow \frac{dy}{dt}=2t

    z(t)=t+\frac{t^3}{3} \Rightarrow \frac{dz}{dt} = 1 +t^2

    1) velocity is just...
  3. Answers
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    1,213

    The tangent of an angle is defined as the...

    The tangent of an angle is defined as the proportion of the opposite side to the adjacent side of a right triangle containing that angle, also called opposite over adjacent. So we can find the height...
  4. Question: equation solving

    by corrigan
    Answers
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    266

    I got it. I was thinking of having e raised to...

    I got it. I was thinking of having e raised to both sides and using the cubic formula. I need to think more before I post.
  5. Question: equation solving

    by corrigan
    Answers
    5
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    266

    Can you verify that the problem is ...

    Can you verify that the problem is 5^{x-2}+5^{x^2}=626 ? I'll help you, but as it stands, it's crazy hard.
  6. Answers
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    1,911

    It's no trouble. I'm in the United States, Texas...

    It's no trouble. I'm in the United States, Texas specifically. If you need anything else, just ask.
  7. Question: Geometry stuff

    by corrigan
    Answers
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    641

    2L+2W=48 and L=3W. Plugging in 3W for L ...

    2L+2W=48 and L=3W.

    Plugging in 3W for L and we get

    2(3W)+2W=48 \Rightarrow 8W=48 \Rightarrow W=6

    and so L=3W=3(6)=18 .
  8. Answers
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    1,911

    Hi adriancavinder, you have a lot of the...

    Hi adriancavinder, you have a lot of the fundamentals down, it refreshing to see someone asking for help on their homework and they've actually attempted the problem.

    For the first question, the...
  9. Answers
    3
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    549

    Oh, I didn't even notice that. Thanks jcarson2,...

    Oh, I didn't even notice that. Thanks jcarson2, stats has never been my strong point. :)
  10. You need to double check your problem, you can't...

    You need to double check your problem, you can't have a hyperbola with vertices (0,4) and (0,0) that passes through point (0, \sqrt{5}) . I think the x value of your third point is a typo, or a...
  11. Okay the first thing you need to notice is that...

    Okay the first thing you need to notice is that this hyperbola opens up and down. The way I know that is because the vertices and the foci are all on the line x=4 . Now the equation for such a...
  12. Answers
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    549

    First of all, I'm assuming you aren't returning...

    First of all, I'm assuming you aren't returning any drawn ball to the bag. The probability against anything happening is simply one minus the probability for it happening. So if p is the probability...
  13. I'm not exactly sure what you mean by "what the...

    I'm not exactly sure what you mean by "what the conic equation is". I think you mean what type of curve it is, also called the conic section. The reason it's called a conic section is because it's...
  14. Answers
    18
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    1,911

    Glad I could help. As far as the gobbledeegook,...

    Glad I could help. As far as the gobbledeegook, formulas look best on this site when put in math brackets. At they beginning of a formula you type [*math] (without the asterisk) and at the end you...
  15. Answers
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    1,911

    Hi AdrianCavinder. I'm sorry I don't have the...

    Hi AdrianCavinder. I'm sorry I don't have the time to fully work this out right now. I have to be at work tomorrow and it's getting late over here. But just at a glance, before you take the...
  16. Nerissa: can you double check you problem. You...

    Nerissa: can you double check you problem. You can't cut and paste, it doesn't display right. The hyperbola question I could kind of guess what you meant, but this one is a little to ambiguous.
  17. Answers
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    I'm assuming that you mean 2x^2 + 4 = 4x +y^2 ....

    I'm assuming that you mean 2x^2 + 4 = 4x +y^2 .
    The first thing we need to do is put this in a form we can use. I can tell you from experience that this is an up-down hyperbola, because it is of...
  18. It's been three month's since my first post, so I...

    It's been three month's since my first post, so I figured it was time for an update. It's really hard I'm not sure where to begin. I guess what I've been doing to heal is as good a place as any. I...
  19. Answers
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    790

    take the ten weeks and subtract it from the total...

    take the ten weeks and subtract it from the total number of weeks, so 14 is the number of weeks that you have left. So take the number of weeks that you have left, and divide it by 24 weeks. So you...
  20. Question: I need help!

    by corrigan
    Answers
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    2,173

    Let A be the number of pounds of type A coffee...

    Let A be the number of pounds of type A coffee used, and let B be the number of pounds of type B coffee used. Since this months blend used three times as many pounds of type B coffee then type A...
  21. Question: Algebra problem

    by corrigan
    Answers
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    635

    Since both containers have the same amount of...

    Since both containers have the same amount of juice, we'll let x be that amount.

    x+54 is the amount in the second container, and x-54 is the amount in the first. If the secon is four times...
  22. Answers
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    617

    "The bare bones about acid effects", "A tooth...

    "The bare bones about acid effects", "A tooth grinding report on the effects of acid on bones", "A story on the tooth fairy, a skeleton and acid", "A skeletal report on acids"
  23. Answers
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    1,911

    You're going to get bogged down with figures....

    You're going to get bogged down with figures. This is one of those problems that you really need to be carful with your calculations. A simple mistake on any step will give you a bad solution....
  24. first of all, you can't just cut and paste. If...

    first of all, you can't just cut and paste. If you mean a normal distribution curve with \mu=20, \sigma^2 =3 and \mu=20, \sigma^2 =6 , it's just two normal curves both centered on 20 with the...
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    First move the -13 to the other side and get ...

    First move the -13 to the other side and get x^2-2x=13 .
    Since the coefficient of x^2 is one, multiply both sides by 4 and get:
    4x^2 - 8x = 52 .
    Square the coefficient of the original x ...
  26. Question: Math

    by corrigan
    Answers
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    670

    This problem is intentionally confusing. The kids...

    This problem is intentionally confusing. The kids and the swimming pool has nothing to do with anything. The fact that the truck broke down 16 miles away means nothing, and the cost per foot of...
  27. Don't know if it's illegal, but I've always heard...

    Don't know if it's illegal, but I've always heard "the rule of seven". Take half your age and add seven, anything above that is acceptable. So half of 16 is 8, add 7, so 15 is the youngest you should...
  28. Graph 3x=y. Your answer is everything below the...

    Graph 3x=y. Your answer is everything below the line. (not including the line)
  29. Question: Maths quiz

    by corrigan
    Answers
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    813

    Piece of cake. Let x be the number. Since x ...

    Piece of cake. Let x be the number. Since x divided by 10 gives a remainder of 9, then x+1 gives a remainder of zero when divided by 10. So x+1 is a multiple of ten. Similarly, since x ...
  30. Question: What to do now?

    by corrigan
    Answers
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    181

    First, let me say I completely understand the...

    First, let me say I completely understand the feeling of disconnection associated with a combat tour. I spent a year looking for IED's in Iraq, I know how far away things can seem. I don't know...
  31. Answers
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    arinteana: We aren't going to do your homework....

    arinteana: We aren't going to do your homework. Show me what you've tried, and tell me what you're stuck on, and I'll help you. Also, don't just cut and paste your problems. The first equation of...
  32. Answers
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    325

    That's exactly right

    That's exactly right
  33. Answers
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    414

    First of all, (y-k)^2 = 4a(x-h) gives a...

    First of all, (y-k)^2 = 4a(x-h) gives a parabola, but it's sideways. We can still derive it, but the only way it's a function is if y is the domain and x is the range. It's a little weird, but...
  34. Answers
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    Sounds like you got it. If you have any more...

    Sounds like you got it. If you have any more questions, I haunt the Math & Science and Mathematics sections.
  35. Answers
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    1,911

    I'm sorry, I don't quite understand where you are...

    I'm sorry, I don't quite understand where you are lost. The answer, \frac{9 \cdot 8 \cdot 7}{3 \cdot 2 \cdot 1} isn't a factorial.

    If you don't understand how we went from \frac{9 \cdot 8...
  36. Question: Other math

    by corrigan
    Answers
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    292

    If you take out the ratio, the largest part would...

    If you take out the ratio, the largest part would be 25.
  37. Answers
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    853

    The negative integer factors would be: -48 and...

    The negative integer factors would be: -48 and -1, -24 and -2, -16 and -3, -12 and -4, -8 and -6. I've never heard of negative integral factors.

    FYI, a quick Google search showed me that an...
  38. Answers
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    684

    ebaines: You're quicker on the draw today than...

    ebaines: You're quicker on the draw today than me. :)
  39. Answers
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    1,911

    If you mean the binomial coefficient, ...

    If you mean the binomial coefficient,
    {n\choose k} = \frac{n!}{k!(n-k)!}

    that's easy enough,

    {9\choose 6} = \frac{9!}{6! \cdot 3!}

    = \frac{9 \cdot 8 \cdot 7 \cdot 6 \cdot 5 \cdot 4...
  40. If you have two consecutive heads and toss a coin...

    If you have two consecutive heads and toss a coin again and it isn't heads, then you will no longer have two consecutive heads. You may get a heads on a subsequent toss, but that would not be three...
  41. Answers
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    601

    While I was typing this I also thought of seeing ...

    While I was typing this I also thought of seeing \equiv is used in modular arithmetic. For example, 9\equiv 15 (\ mod{6}) . Now that I think about it, that is probably the most popular use for it....
  42. Answers
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    does it look like this -----> \equiv . It's a...

    does it look like this -----> \equiv . It's a general equivalence relation symbol, that is it's used to indicate an equivalence between the two objects on either side of the relation symbol. The...
  43. Since x+y =z and x+y+z=3000 , we get ...

    Since x+y =z and x+y+z=3000 , we get
    x+y+z=z+z=2z=3000 \Rightarrow z=1500
    And since x+y= z= 1500 \Rightarrow x=1500-y
    So
    .12 \cdot x +.13 \cdot y + .14 \cdot z = 400
    \Rightarrow .12...
  44. Question: When to break up

    by corrigan
    Answers
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    276

    Sexual attraction is necessary, but by no means...

    Sexual attraction is necessary, but by no means sufficient, for a relationship. As far as not liking his sense of humor, I think a lot of times we're willing to tolerate more if we're more attracted...
  45. Question: AP Statistics

    by corrigan
    Answers
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    3,675

    Statistics isn't my specialty, so I apologize in...

    Statistics isn't my specialty, so I apologize in advance if I get the terms wrong.

    What you need to do is find out how many children in the study have an alcohol related issue and have one...
  46. Answers
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    Tut: Sorry, I didn't see your answer before my...

    Tut: Sorry, I didn't see your answer before my last post. The answer was right, but the way you got there was imprecise. Your solution implies that the rocket was going at a constant velocity of 600...
  47. Answers
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    I got the change in D by taking the derivative...

    I got the change in D by taking the derivative of D . Remember, D was simply a function in terms of the height. Perhaps a less confusing way to look at it would be:

    D = \sqrt{H^2 +400^2} ...
  48. JudyKayTee: I never said she was anything, just...

    JudyKayTee: I never said she was anything, just that she might be emotionally abusive. And the issue was not that she didn't want to date him it was that she did want to and then didn't, and then she...
  49. It's possible that this is one of those girls...

    It's possible that this is one of those girls that likes not liking her relationship. She'll say she hates relationships, but instead of not being in a relationship, she'll always be in one...
  50. Answers
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    Show me what you've tried and where you are...

    Show me what you've tried and where you are stuck, and I'll be happy to help you. Also you need to rewrite your equation. Some of the signs didn't show, and I'd need to know exactly what it is you...
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