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

Re: How many combinations

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.
by maggiemagnet
Wed Aug 12, 2015 2:33 pm
Forum: Beginning Algebra
Topic: Rearranging Formulae
Replies: 5
Views: 162

Re: Rearranging Formulae

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 + v2)/(u + v)

R(u + v) = u + v2

Ru + Rv = u + v2...

:clap:
by maggiemagnet
Wed Aug 12, 2015 3:12 am
Forum: Beginning Algebra
Topic: Rearranging Formulae
Replies: 5
Views: 162

Re: Rearranging Formulae

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

Re: Radical answer confirmation

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

Re: Radical answer confirmation

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.
:clap:
by maggiemagnet
Tue Jul 28, 2015 12:33 am
Forum: Statistics
Topic: number sequences help
Replies: 7
Views: 217

Re: number sequences help

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

Re: Proof that time goes faster the older you get - Help?

"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...
by maggiemagnet
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

Re: Determining depth of various percentages of sunlight beneath ocean surface

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? ...
by maggiemagnet
Mon Jul 27, 2015 7:50 pm
Forum: Statistics
Topic: number sequences help
Replies: 7
Views: 217

Re: number sequences help

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

Re: Reduced row ech help

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...

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