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by maggiemagnet
Fri Jul 31, 2015 12:36 am
Forum: Beginning Algebra
Topic: Radical answer confirmation
Replies: 8
Views: 82

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: 82

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: 127

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: 83

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: 83

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: 127

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: 232

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...
by maggiemagnet
Thu Jun 18, 2015 1:57 am
Forum: Intermediate Algebra
Topic: Two equations with two unknowns
Replies: 2
Views: 250

Re: Two equations with two unknowns

You have to get X and Y. \dfrac{p\, -\, y\, -\, \dfrac{x\, (h\, -\, x)}{y}}{h\, -\, x}\, =\, \dfrac{p\, -\, q}{h} x^2\, +\, y^2\, =\, a^2 You have 2 equations with 6 variables. It is not possible to solve for numerical values. Are you maybe supposed to solve for x and y (which are different...
by maggiemagnet
Wed Jun 17, 2015 10:58 am
Forum: Advanced Algebra ("pre-calculus")
Topic: How to solve an equation with a variable as exponent?
Replies: 1
Views: 140

Re: How to solve an equation with a variable as exponent?

I'm asked to solve a problem with the equation 6^x = 24x^2 I don't think there is any way to do this with algebra. The left side is an exponential and the right side is a polynomial. You can see the formal solution here: http://www.wolframalpha.com/input/?i=solve+6^x+%3D+24x^2 (Copy and paste the l...
by maggiemagnet
Sat Jun 13, 2015 3:03 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: How to Determine which circle has the larger radius by inspection?
Replies: 1
Views: 143

Re: How to Determine which circle has the larger radius by inspection?

A problem is given with two equations for a circle and I am asked to determine which has the larger radius. I know how to solve the problem by calculation and answered correctly. But I want to know is there a way to distinguish which circle has the larger radius at first glance without solving exte...

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