- Sat May 14, 2016 10:56 pm
- Forum: Trigonometry
- Topic: Averaging Amplitudes of Different Frequency Bands
- Replies:
**1** - Views:
**71**

Hello everyone! I am in a pickle right now as I attempt to move forward in my research project on neurofeedback. I am trying to calculate the theta/beta ratio for individual subjects and then compare them statistically. Are you talking about brain waves, like they show here ? The issue I am having ...

- Sat May 14, 2016 10:43 pm
- Forum: Calculus
- Topic: How to prove f(x) = (cx-c*x+x-1)/(2x-x-1), where 1<c<2 is decreasing function?
- Replies:
**3** - Views:
**79**

Jinliang wrote:I have plotted the aforementioned function curves of f(x) with different c, and found that it seems to be monotony function. However, it is too hard to me to prove it. May you help me ?

How did they do the proofs in their worked examples? What method are you expected to use? Thank you!

- Thu Apr 21, 2016 8:52 pm
- Forum: Arithmetic
- Topic: Million and Billion Conversion
- Replies:
**1** - Views:
**397**

How many zeros does a million and billion have. That depends on the definitions of "million" and "billion" which (I think) vary between countries. Like "billion" in America is "a thousand million" but I'm pretty sure it's something different ("a million ...

- Thu Apr 21, 2016 8:46 pm
- Forum: Statistics
- Topic: Wilcoxon Signed Rank Test
- Replies:
**1** - Views:
**262**

rmoyer wrote:Is there a quick and easy way to accomplish this on SPSS 14?

I looked up "SPSS 14" in Google. This is a software package, right? If there are forums that offer help for that package, then maybe they could help you set up the commands (?) correctly there. Good luck!

- Sat Apr 02, 2016 2:25 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: solving for x given: 4e^-.2x + 3e^-.3x = 5
- Replies:
**4** - Views:
**189**

how do I solve for x given: 4e^-.2x + 3e^-.3x = .5 This one is at least as bad as your other one! x\, =\, 10 i \, \bigg(2 \pi n\, +\, \pi\, -\, i \log\left[ \, \dfrac{\left(1\,-\, i\, \sqrt{3\,}\right)\, \sqrt[3]{27\,+\,i\, \sqrt{807\,}\,}}{2\, \times\, \sqrt[3]{9\,}}\, +\, \dfrac{4\, \...

- Sat Apr 02, 2016 2:15 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: solving for x, given exponentials: 4e^2x + 5e^3x = 15
- Replies:
**7** - Views:
**473**

(a^b)(a^c)=(a^(b+c)) so above factoring won't work You're right! I think maybe "FWT" hadn't had his/her caffeine yet when s/he posted that! :v_confused: According to Wolfram's "Alpha" solver, this doesn't solve simply. They give this: x\, =\, i \, \left(2 \pi n\, -\, i \log\...

- Fri Mar 25, 2016 1:00 am
- Forum: Pre-Algebra
- Topic: Simple algebra
- Replies:
**1** - Views:
**475**

Is x = x - 1 indeterminate or undefined? What is the definition of "indeterminate"? What is the definition of "undefined"? (I think your book is using what is often called "all solution" and "no solution": try this lesson for comparison.) When you solved the ...

- Mon Mar 14, 2016 3:24 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: TI Nspire Calculator Solution Display Question
- Replies:
**1** - Views:
**265**

I would have thought that your question would be a common one because most schools (so most software that they're using) use the regular format of "(the number) plus or minus (the radical)". But I can't find anything online about changing the format of the display. Sorry.

- Wed Feb 10, 2016 2:34 pm
- Forum: Beginning Algebra
- Topic: If 5,a,b are multiplied to form the product 5ab then...
- Replies:
**6** - Views:
**803**

i have a simple question here, i was reading hall and knight algebra .there it was said that if 5,a,b are multiplied to form the product 5ab then 5 is called the coeffitient of remaining factors.i here have a question. 5 is a coeff of a or b or ab?what is correct? The coefficient is the number-only...

- Mon Jan 04, 2016 12:44 am
- Forum: Intermediate Algebra
- Topic: Need help finding f(x)
- Replies:
**1** - Views:
**832**

how can I find: ((f(x+h) - f(x))/h If f(x) = 1/(square root x) Can someone help me? You can do this like they show here . Work it step by step like they show. What is f(x) for this? What is f(x + h), after simplifying? What is the subtraction, after simplifying? Please show all your work for each p...