- Tue Oct 06, 2015 1:25 pm
- Forum: Beginning Algebra
- Topic: Discrete-Time Function
- Replies:
**4** - Views:
**52**

this is not all, but I am just preparing the ground what does this mean? :confused: Consider: f(x(n)) = y(n) = n*x(n) View f as a black box that takes as input some function x(n) and gives as output y(n). And consider that: x(n) is 1 for n = 0,1,2,3 and 0 everywhere else. Then f(x(n)) = y(n) is for...

- Tue Oct 06, 2015 1:20 pm
- Forum: Beginning Algebra
- Topic: Need help with Factoring
- Replies:
**3** - Views:
**29**

diane123 wrote:Oh wow, thank you so much! How do I know to pair 21n^3 with 35n and 18n^2 with -30?

u dont

like i said: if it doesnt work 1 way, try a different way

see what happens

- Tue Oct 06, 2015 1:19 pm
- Forum: Trigonometry
- Topic: Help for calculating a point inside a pitched draw
- Replies:
**3** - Views:
**37**

Filippo wrote:Yes i need the interior points. The problem is to find the Y coordinates of the two top points.

how did u get the x coords?

can u do the same thing for y coords?

- Mon Oct 05, 2015 9:37 pm
- Forum: Intermediate Algebra
- Topic: Linear Programming shortest path
- Replies:
**3** - Views:
**37**

Alexinho wrote:Which information would you need in order to solve this task?

like where are the locations? restrictions on movement (like staying on a grid of streets)?

when you rite back plz show what u did so far

- Sun Oct 04, 2015 9:13 pm
- Forum: Beginning Algebra
- Topic: Need help with Factoring
- Replies:
**3** - Views:
**29**

I need help with this problem: 63n^3+54n^2-105n-90 The answer is: 3(3n^2-5)(7n+6) I don't understand the answer... when I tried to solve it, this is what I did: (63n^3+54n^2)-(105n-90) b/c of the "-" in front of the parens this should be (63n^3 + 54n^2) - (105n + 90) 9n^2(7n+6)-3(35n+30) ...

- Sun Oct 04, 2015 9:05 pm
- Forum: Statistics
- Topic: How to interpolate this.
- Replies:
**3** - Views:
**58**

they say that more info is needed here: http://www.edaboard.com/thread344592.html

did the hint about linearity help at all?

did the hint about linearity help at all?

- Fri Oct 02, 2015 10:53 pm
- Forum: Beginning Algebra
- Topic: Algebra word problems
- Replies:
**2** - Views:
**75**

A child with an ear infection is given a 200mg ampicillin tablet once every four hours. About 12% of the drug in the body at the start of a four -hour period is still there at the end of that period. Calculate the quantity of ampicillin in the body right after taking the third tablet is given. If w...

- Mon Jul 20, 2015 4:51 pm
- Forum: Beginning Algebra
- Topic: Find the savings plan balance after 18 months with an APR of 7% and monthly payments of $150.
- Replies:
**1** - Views:
**259**

I need help but Im not sure what category the math problem that I am trying to solve goes under. There are three questions that I am trying to solve. Question 7: Find the savings plan balance after 18 months with an APR of 7% and monthly payments of $150. the balance is $ Do not round to the final ...

- Wed Jul 08, 2015 1:56 am
- Forum: Beginning Algebra
- Topic: Exercises
- Replies:
**2** - Views:
**321**

OK, now I have the purplemath CD. I don't see any exercises on the CD tho or worksheets. U mean U got this?: http://www.purplemath.com/lessoncd.htm it says "the entire Purplemath web site, modified for offline viewing." there arent any worksheets/exercises/etc on the site i think?? :wave:

- Tue Jun 30, 2015 11:55 pm
- Forum: Discrete Math
- Topic: solve this difficult number sequence
- Replies:
**3** - Views:
**561**

Is there a plausible solution for this number sequence? It was posted on another web forum a few years ago by somebody who claimed it came from an IQ test that he couldn't solve. Nobody has posted a reasonable solution. It's bugged me. It does not appear to have any pattern at all even after lookin...