- Fri Jul 31, 2015 12:36 am
- Forum: Beginning Algebra
- Topic: Radical answer confirmation
- Replies:
**8** - Views:
**64**

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:
**64**

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:
**91**

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:
**63**

"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:
**65**

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:
**91**

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:
**215**

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...

- Thu Jun 18, 2015 1:57 am
- Forum: Intermediate Algebra
- Topic: Two equations with two unknowns
- Replies:
**2** - Views:
**245**

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...

- 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:
**136**

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...

- 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:
**139**

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...