 Ask Remember Me?

# Search:

Type: Posts; User: corrigan

1. ## Question: Vectors Maths

by corrigan
4
Views
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
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. ## Question: It is Pre Calculus

by corrigan
1
Views
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
5
Views
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
5
Views
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. ## Question: Factorials by inductive definition

by corrigan
18
Views
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
1
Views
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. ## Question: Factorials by inductive definition

by corrigan
18
Views
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. ## Question: ask a probability question?

by corrigan
3
Views
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. ## Question: Find the standard form of the equation with the given characteristics?

by corrigan
1
Views
1,225

### 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. ## Question: Find the standard form of the hyperbola with the given characteristics?

by corrigan
2
Views
1,856

### 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. ## Question: ask a probability question?

by corrigan
3
Views
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. ## Question: 2x^2 2x 2y^2-6y-11=0 how do I find out what the conic equation is?

by corrigan
1
Views
810

### 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. ## Question: Factorials by inductive definition

by corrigan
18
Views
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. ## Question: Factorials by inductive definition

by corrigan
18
Views
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. ## Question: What is the vertex anf focus of 9x^2 8y^2-15x 8x 27=0

by corrigan
1
Views
703

### 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. ## Question: What is the vertex of 2x^2 4=4x y^2?

by corrigan
1
Views
652

### 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. ## Question: Why is there a double standard with wanting children?

by corrigan
26
Views
1,092

### 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. ## Question: Mathematics- Proportion

by corrigan
3
Views
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
1
Views
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
1
Views
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. ## Question: Science fair titles?

by corrigan
2
Views
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. ## Question: Factorials by inductive definition

by corrigan
18
Views
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. ## Question: In each case, sketch the two specified normal curves on the same set of

by corrigan
1
Views
1,309

### 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...
25. ## Question: Solve using Indian Method

by corrigan
1
Views
782

### 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
4
Views
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. ## Question: Is it illegal for a 16 year old and a 13 year old to date?

by corrigan
10
Views
2,774

### 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. ## Question: Graph the first-degree inequalities in two unknowns in the problem

by corrigan
1
Views
1,913

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

by corrigan
1
Views
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
2
Views
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. ## Question: Perpendicular lines.

by corrigan
3
Views
470

### 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. ## Question: What is the property (9x2)x1=9x2

by corrigan
1
Views
325

### That's exactly right

That's exactly right
33. ## Question: Question About Calculus..

by corrigan
1
Views
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. ## Question: Factorials by inductive definition

by corrigan
18
Views
1,911

### 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. ## Question: Factorials by inductive definition

by corrigan
18
Views
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
3
Views
292

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

If you take out the ratio, the largest part would be 25.
37. ## Question: What does negative integral factors mean?

by corrigan
1
Views
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. ## Question: Pounds per sq. inch

by corrigan
2
Views
684

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

ebaines: You're quicker on the draw today than me. :)
39. ## Question: Factorials by inductive definition

by corrigan
18
Views
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. ## Question: Expected number of coin tosses to get N consecutive heads ?

by corrigan
3
Views
4,334

### 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. ## Question: What is the meaning of this icon?

by corrigan
4
Views
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. ## Question: What is the meaning of this icon?

by corrigan
4
Views
601

### 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. ## Question: Equations to be solved by Elimination and Substitution Process

by corrigan
2
Views
745

### 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
2
Views
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
1
Views
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. ## Question: Distance and speed

by corrigan
8
Views
816

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. ## Question: Distance and speed

by corrigan
8
Views
816

### 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. ## Question: What did this girl want from me by doing all of this?

by corrigan
5
Views
424

### 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. ## Question: What did this girl want from me by doing all of this?

by corrigan
5
Views
424

### 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...

by corrigan