- Thu Aug 20, 2015 12:49 am
- Forum: Discrete Math
- Topic: How many combinations
- Replies:
**3** - Views:
**74**

But the point of "random" is that any pattern is only something you THINK you're seeing. Yes, you can cherry-pick subsets out of all the data, but the only "pattern" is something you have decided on. It isn't something that can be predicted.

- Wed Aug 12, 2015 2:33 pm
- Forum: Beginning Algebra
- Topic: Rearranging Formulae
- Replies:
**5** - Views:
**162**

wertert wrote:R=(u+v^2)/(u+v), make u the subject of the formula.

wertert wrote:so any chance you could run through a solution for this problem ? Still not 100% happy with the result.

What did you get? What were your steps? Please start with the 1st step of cross-multiplying:

R = (u + v

R(u + v) = u + v

Ru + Rv = u + v

- Wed Aug 12, 2015 3:12 am
- Forum: Beginning Algebra
- Topic: Rearranging Formulae
- Replies:
**5** - Views:
**162**

R=(u+v^2)/(u+v), make u the subject of the formula. We would normally start this by mutiplying both sides by (u+v). However our query is ... Can't you cancel out v before hand ?!? i.e making it R=(u+v)/u ? I don't think you can but I can't find any examples explaining why not.... Try the second exa...

- Fri Jul 31, 2015 12:36 am
- Forum: Beginning Algebra
- Topic: Radical answer confirmation
- Replies:
**8** - Views:
**154**

Part of the problem is that there isn't a standard definition of "simplified". Also you're looking for equivalent forms, not solutions, so you can't really plug in and check. Mostly you just need experience to know what looks right, I think. But you can kind of check values by plugging int...

- Wed Jul 29, 2015 1:54 pm
- Forum: Beginning Algebra
- Topic: Radical answer confirmation
- Replies:
**8** - Views:
**154**

Vl305 wrote:How do i confirm or check the answer when told to simplify an expression or a radical. Equations are easy to check but simplification problems a method has not been explained.

What do you mean by confirming a simplification? Thanks.

- Tue Jul 28, 2015 12:33 am
- Forum: Statistics
- Topic: number sequences help
- Replies:
**7** - Views:
**217**

It's kinda hard to explain formulas if we don't know what the variables, etc, mean. Where did you get these formulas?

- Mon Jul 27, 2015 7:58 pm
- Forum: Advanced Algebra ("pre-calculus")
- Topic: Proof that time goes faster the older you get - Help?
- Replies:
**2** - Views:
**214**

"Herewith the mathematical proof that time goes faster the older you get. Define x as the speed of time when you are middle-aged, say, for instance, when you are 40. Define y as the speed of time when you are a child, say, for instance, when you are 8. He picked these specific numbers. This ma...

- Mon Jul 27, 2015 7:51 pm
- Forum: Intermediate Algebra
- Topic: Determining depth of various percentages of sunlight beneath ocean surface
- Replies:
**1** - Views:
**171**

I'm having a difficult time trying to figure out how to determine at what depth beneath the surface of the ocean that there is 1% sunlight. Here is the function that was provided: f(x) = 17(0.965)^x I keep getting 16.405 but it says that's incorrect. How did you get that? What does this stand for? ...

- Mon Jul 27, 2015 7:50 pm
- Forum: Statistics
- Topic: number sequences help
- Replies:
**7** - Views:
**217**

Google has no results, nor does the Online Encyclopedia of Integer Sequences doesn't, either. If you really need all the numbers in all of the rows to get the next row then maybe this is something where you need to go down the columns? (But OEIS doesn't have anything for the columns either.) Do you ...

- Mon Jun 22, 2015 8:21 pm
- Forum: Matrix (Linear) Algebra
- Topic: Reduced row ech help
- Replies:
**1** - Views:
**321**

The problem is to turn [1 1 1 5] [2 2 2 14] [6 6 6 30] into reduced row echelon form. My work and online calculators I have check yield [1 1 1 0] [0 0 0 1] [0 0 0 0] Yet the answer provided in the text book I am working from is [1 0 0 0] [0 0 0 1] [0 0 0 0] Which one is correct? Probably both are k...