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  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#10301 Re: Exercises » Sequences! » 2011-08-04 04:27:16

no no i try them of course.what are you doing on the first one?

#10302 Re: Exercises » Sequences! » 2011-08-04 04:20:10

the US elevator was funny.

#10303 Re: Exercises » Sequences! » 2011-08-04 04:18:17

the roman one was amazing never woulda guessed.

there is also the read and write one.

#10305 Re: Exercises » Sequences! » 2011-08-04 04:10:36

the frist one is easy:
.1,+1,.2,+2,.3,+3,...

#10306 Re: Exercises » Limits! » 2011-08-04 04:08:04

sqrt(-1) doesnt exist because it is indefined.

#10307 Exercises » Sequences! » 2011-08-04 03:06:21

anonimnystefy
Replies: 83

I have been waiting for a long time to open this topic.

i have some questions about these but all in good time.first step is to open up the topic.

so here you can post anything useful,interesting,helpful about sequences,any problem involving the same.

#10309 Re: Help Me ! » Solving Quadratics by Factoring and Graphing » 2011-08-04 02:50:27

well you shouldn't this one has a lot of use in the future.

#10313 Re: Help Me ! » Solving Quadratics by Factoring and Graphing » 2011-08-03 10:14:27

the only answer that is asked is the positive one which is 8.

but if it told you to look at all integers and not just the positive ones than it would be 8 and -9.

#10314 Re: Help Me ! » Solving Quadratics by Factoring and Graphing » 2011-08-03 10:09:19

i already told you that you shouldn't do that,so no you don't switch negative to positive.

#10316 Re: Help Me ! » Solving Quadratics by Factoring and Graphing » 2011-08-03 10:02:59

no,no,if you change them to positive they wouldn't be correct answers.the negative ones i think should not be posted.

has your teacher told you anything about negatives in these problems?

#10317 Re: Help Me ! » Solving Quadratics by Factoring and Graphing » 2011-08-03 09:55:58

hi zee-f

your -9 solution was correct but it wasn't included because you are looking for positive solutions as bobbym explained.it was correct the first time,so don't worry about that one.

also for the #17 you take only the 7 because it is positive.you don't take -9 because it is negative.

#10323 Re: Help Me ! » An interesting equation » 2011-08-02 23:32:04

well actually i could use the fact that alpha is greater or equal to zero and less than one but i don't know what to do then.

#10324 Re: Help Me ! » An interesting equation » 2011-08-02 22:45:40

hi guys

i have just noticed that it should be -13floor(x).sorry about that.
also i was wondering if a method could work because i tried to do it that way and didn't get the answer,but if you were to help maybe i could gete it:

#10325 Re: Puzzles and Games » Issue with the black and white hat logic puzzle » 2011-08-02 22:25:07

hi flip550

in your case the middle man would know that his hat is white.so that case doesn't match the propositions.

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