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Type: Posts; User: stapel

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1. Thread: Use trigonometric identities to verify each identity: cot(A/2) - tan(A/2) = 2cotA and

by stapel
Replies
1
Views
63

You bet!

Please reply with a clear listing of your thoughts and efforts so far on each of the above equations. Once we can see what you've tried and where you're stuck, we'll be able to respond...
2. Thread: double compound formulae and other bits: If θ is fixed real number w/ 0≤θ<2π, show...

by stapel
Replies
2
Views
83

We'll be glad to help! But first, we'll need to...

We'll be glad to help! But first, we'll need to know where you're stuck. For instance, what identities have they given you? How have you applied identities to the equation? And so forth?

3. Thread: Mathematics: Wanting to re-learn from the ground up, through undergraduate classes

by stapel
Replies
7
Views
314

One place to get started might be your local...

One place to get started might be your local Kumon Tutoring Centre. ;)
4. Thread: Factorise x^4 - x^2 + 1 fulling by completing the square

by stapel
Replies
9
Views
368

What have you tried (including the suggestion...

What have you tried (including the suggestion provided earlier)? How far have you gotten? Where are you stuck?

Please be complete. Thank you! ;)
5. Thread: how to calculate the value of 'x', If 16^x = 2?

by stapel
Replies
12
Views
391

No. The 24 accounts only for the 16, not for the...

No. The 24 accounts only for the 16, not for the variable. Restate the entire equation:

. . . . .(24)x = 21

Then use exponent rules to condense the power on the left-hand side. Then equate the...
6. Thread: Sound localisation using multilateration?

by stapel
Replies
3
Views
157

What were you taught, in preparation for your...

What were you taught, in preparation for your class project? Thank you! ;)
7. Thread: Calculus: Derive eqns for temp probe from Newton's Law, data points

by stapel
Replies
4
Views
321

Would it be correct to gather that you and fellow...

Would it be correct to gather that you and fellow students ran this experiment, and that the data are derived from that experiment?

My guess would be the temperature(s) when the probe was about...
8. Thread: what is the integral of 2^(2x)? need help tonight, exam is tomorrow

by stapel
Replies
21
Views
552

The other thread here for this question has now...

The other thread here for this question has now been moved from "Algebra" to "Calculus".

If the original poster thought that this was an "Algebra" question, this could explain the lack of work or...
9. Thread: Mathematical Induction - Unknown general term for the sum side.

by stapel
Replies
2
Views
123

As advised by side moderators, Imgur has become problemmatic, so links to that site are generally not followed.

Please either upload the image to the forum, or type out the text. Thank you! ;)
10. Thread: Express of a statement that have universal quantifiers

by stapel
Replies
1
Views
110

I would say that your sentence is the better one....

I would say that your sentence is the better one. The first one reads as though the author is not a native speaker of English, so I may be misunderstanding the meaning. But I don't see the "for all...
11. Thread: Calculate standard deviation of 4.7%, 16.4%, 30.1%, 19.9%

by stapel
Replies
1
Views
127

I'm not clear on what is being asked. You are...

I'm not clear on what is being asked. You are given the returns on the stock (that is, the percentage increase or decrease on the value of the stock), but are asked for the standard deviation of "the...
12. Thread: Error 500 - Internal Server Error

by stapel
Replies
3
Views
351

In my experience, it's because some sequence of...

In my experience, it's because some sequence of characters within somebody's posting is conflicting somehow (???) with the back-end script. The back-end script panics, which causes the server to gag,...

by stapel
Replies
8
Views
2,271

by stapel
Replies
11
Views
384

Yes! ;)
15. Thread: Computing expected value of policy to insurance company.

by stapel
Replies
2
Views
115

What did you get when you tried doing this? ...

I am struggling with a similar problem. How did you get (0.000408)[/QUOTE]
What did you get when you tried doing this?

Please be complete. Thank you! ;)
16. Thread: What are the odds of dealing three 7's in a deck of cards?

by stapel
Replies
4
Views
118

Okay. And how many are 7s?

Okay. And how many are 7s?
17. Thread: Probability: Distributing lottery tickets over multiple lotteries (permanent rewards)

by stapel
Replies
1
Views
60

1. The word "too", in English, means "also" (as...

1. The word "too", in English, means "also" (as in, "He played the lottery; she played the lottery, too") or "overly" or "exceedingly" (as in, "While working with the table saw, he stuck his finger...
18. Thread: R squared value for a scatter plot is over 1: (97*2,629,673 - 17056^2)

by stapel
Replies
3
Views
117

It's negative. You're not going to get a...

It's negative. You're not going to get a real-valued root.

Um... What "formula"? What "data"? What are you talking about? :|

by stapel
Replies
4
Views
355

Since "Pa" (or "Pascals") is a unit of pressure...

Since "Pa" (or "Pascals") is a unit of pressure itself, I'm not understanding the "units" of "pressure per 105 Pascals"...? Also, are these the "units" for both of the axes?

Does this mean that...
20. Thread: Integral of 1/(2x+1): different methods give different results??

by stapel
Replies
4
Views
182

Yes. Set the two results equal to each other,...

Yes. Set the two results equal to each other, using different constants:

. . . . .\dfrac{1}{2}\, \ln(2x\, +\, 1)\, +\, C\, =\, \dfrac{1}{2}\, \ln\left(x\, +\, \dfrac{1}{2}\right)\, +\, D
...
21. Thread: Null - Alternative hypothesis: target discharge measurement at least 1075mAh

by stapel
Replies
2
Views
92

We'll be glad to help! We just need to know what...

We'll be glad to help! We just need to know what you've tried and where you're stuck. Thank you! ;)
22. Thread: 1 pencil, 1 pen cost $8; 2 pencils, 3 pens cost$21; find cost of pencil, pen

by stapel
Replies
1
Views
188

Since you posted this to "Pre-Algebra" and...

Since you posted this to "Pre-Algebra" and haven't even picked any variables, I'll assume that you don't know about variables and other algebraic stuff. So let's use plain arithmetic.

i. You are...
23. Thread: Multiplication of arithmetic series to get 3rd series w/ 1st 3 terms: 468, 462, 384

by stapel
Replies
11
Views
384

See where it leads. Multiply stuff out: . . ....

See where it leads. Multiply stuff out:

. . . . .i. ab = 468

. . . . .ii. ab + bd + ae + de = 462

. . . . .iii. ab + 2bd + 2ae + 4de = 384

Subtracting (i) from each of (ii) and (iii)...
24. Thread: need some help with trig function: 4 sin(a + pi/6) cos(a - pi/6)

by stapel
Replies
3
Views
272

There is no "equals", so this is not an...

There is no "equals", so this is not an "equation" and cannot be "solved". What were the actual instructions?