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Type: Posts; User: lookagain

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1. ## Thread: Question related to Cantor's Theory

by lookagain
Replies
6
Views
244

### I don't think you're missing anything. My idea...

I don't think you're missing anything. My idea may work for finite sets, but I have one or more flaws with my demonstration
with these infinite sets. It does not work here.
2. ## Thread: Question related to Cantor's Theory

by lookagain
Replies
6
Views
244

### I'll use a different set-up (read: ordering),...

I'll use a different set-up (read: ordering), possibly as you suggested.

Every {2n}, a set which is an element of the powerset of A, gets paired to 2n, an even integer which
is an element of the...
3. ## Thread: Question related to Cantor's Theory

by lookagain
Replies
6
Views
244

### If your "N" stands for the positive integers,...

If your "N" stands for the positive integers, then set A is the set of positive even integers.

Sets A and N have positive integers as their elements.

P(A), the powerset of A, has sets as its...
4. ## Thread: Parallel: Is y = 3y -7 and y = -3x -2 parallel? Why or why not?

by lookagain
Replies
20
Views
672

### No,, I do not expect the first equation is...

No,, I do not expect the first equation is correct.

Check the source (again?) to see if it should be "y = 3x - 7" instead.
5. ## Thread: Step-by-step soln for 9/[2(x+1)] + 1/[x-1] = [x+1]/[2(x-1)]

by lookagain
Replies
8
Views
414

### Please do not give out a detailed solution...

Please do not give out a detailed solution without the student attempting and showing work here, as well as it has
only been the next day. Note how a prompt was given to the student just before...
6. ## Thread: Basic Algebraic exponential formula. Solve ((X/287,173.53)^1/10)-1=.865, w/ proof

by lookagain
Replies
3
Views
251

### You don't having matching parentheses. You don't...

You don't having matching parentheses. You don't need that extra parenthesis
in front. You do need grouping symbols around that fractional exponent:

(X/287,173.53)^(1/10) - 1 = .865
7. ## Thread: e^pi or pi^e: How to determine which is bigger without a calculator?

by lookagain
Replies
13
Views
786

### e^x \ge x + 1. e^x = x + 1 \ \ only where x =...

e^x \ge x + 1.

e^x = x + 1 \ \ only where x = 0.
8. ## Thread: what is the integral of 2^(2x)? need help tonight, exam is tomorrow

by lookagain
Replies
21
Views
1,039

### y=22x/(2ln2) + C The derivative of 22x ...

y=22x/(2ln2) + C

The derivative of 22x \ \ne \ 2e2x
9. ## Thread: Divisibility: Show that 360 divides s^2 (s^2 - 1) (s^2 - 4).

by lookagain
Replies
6
Views
359

### For s an integer, show that 360 divides \...

For s an integer, show that 360 divides \ s^2(s^2 - 1)(s^2 - 4).

Or:

For s an integer, show that \ s^2(s^2 - 1)(s^2 - 4) \ is divisible by 360.

Writing "no remainder" is redundant. ...
10. ## Thread: If 2^x = 10, then how to calculate the value of 'x'?

by lookagain
Replies
36
Views
1,531

### On the left-hand side of the equation, the "x"...

On the left-hand side of the equation, the "x" should not be as low as it is. It should on the same level as "log."

a^log_ax \ = \ x. \ \ \ Also, \ a \ne 1, as well as a > 0.
11. ## Thread: If f(x) = 2x-5x^2 and g(x) = 5x+2, what is f(4)?

by lookagain
Replies
16
Views
620

### This is not a teaching site. You are to learn...

This is not a teaching site.

You are to learn that in the classroom. Tutors/helpers are to coach/reinforce what you have already gone over and have questions
over and/or shown some attempts here.
12. ## Thread: Integral of 1/(2x+1): different methods give different results??

by lookagain
Replies
4
Views
307

### The natural log will take the absolute value bars...

The natural log will take the absolute value bars in conjunction here:

(1/2)*ln|2x+1| + C
13. ## Thread: Find a whole number that is both perfect square and cube found between 2000 and 10000

by lookagain
Replies
3
Views
279

### "Brute force" was stated, but it is not required....

"Brute force" was stated, but it is not required.

Because it is a perfect square, it is of the form \ N^2.

Because it is also a perfect cube, it is also of the form \ M^3 .

x^6 \ = \...
14. ## Thread: Need help understanding these types of problems: fencing 2 side-by-side areas

by lookagain
Replies
15
Views
860

### Also, there is this: .

Also, there is this:

.
15. ## Thread: Need help understanding these types of problems: fencing 2 side-by-side areas

by lookagain
Replies
15
Views
860

### And to think you were outstanding in your field.

And to think you were outstanding in your field.

by lookagain
Replies
2
Views
371

### Don't try to use the wording in either 1 or 4. ...

Don't try to use the wording in either 1 or 4. See this related material:
...
17. ## Thread: Need help understanding these types of problems: fencing 2 side-by-side areas

by lookagain
Replies
15
Views
860

### You can't forget about the [cost of the] shared...

You can't forget about the [cost of the] shared fence. The solutions don't involve pastures that are square-shaped.

That is, the pastures turn out not to be square-shaped.

by lookagain
Replies
5
Views
754

### "(Whatever) times greater/smaller than" is...

"(Whatever) times greater/smaller than" is wrong/poor wording from the start. It should
never be used in writing. The problem should just have been phrased as:
"Find a double-digit number which...

by lookagain
Replies
4
Views
351

.
20. ## Thread: (Help) Simplifying by factoring question for 45x^6 = 9x^4

by lookagain
Replies
3
Views
422

### The answers page is incorrect if you presented it...

The answers page is incorrect if you presented it fully. In the context of this specific problem,
it is not allowable to divide by the variable, because information is lost.

45x^6 = 9x^4
...
21. ## Thread: find x if the numbes 3-x, x, and 1-3x form an arithmetic sequence.

by lookagain
Replies
7
Views
464

### hamburgerman1212, let d = the common...

hamburgerman1212,

let d = the common difference.

3 - x + d = x
x + d = 1 - 3x
----------------

2x - d = 3
4x + d = 1
22. ## Thread: Solve x-7/2 + 6/x = 1/2

by lookagain
Replies
6
Views
403

### These particular denominators need grouping...

These particular denominators need grouping symbols:

{x(x - 7) + (6)(2)}/(2x) = 1/2

{x^2 - 7x + 12}/(2x) = 1/2

by lookagain
Replies
14
Views
1,059

### And this is how the truth value of the second...

And this is how the truth value of the second step can be seen to be independent from the truth value of the first step.

by lookagain
Replies
14
Views
1,059

### Your first two sentences in that quote box where...

Your first two sentences in that quote box where you address stapel make no sense,
because she never stated to what you objected/emphasized. In her question, she refers
to assuming for n = k, not...

by lookagain
Replies
14
Views
1,059