Math halp. (Geometric Sequences)

2011-02-06 21:53:43

#1

TheDonkey: Eat my bearrrrrrrrrrr, Tonighttt; +163|5768|Vancouver, BC, Canada

I've been trying to ask around, but nobody seems to know what the teacher wants here. (I'm taking math online so people at school are learning slightly different things)

3) This question is a little more complex, but not beyond your abilities to reason. In question 1), you were given the numbers 1 to 20, and told to form geometric sequences from these. What is the maximum common ratio you can use for these sequences? Please explain your reasoning. Hint: this question can be answered beautifully by using the geometric mean.

Karmaz for halp.

2011-02-06 21:58:10

#2

AussieReaper: ( ͡° ͜ʖ ͡°); +5,761|6204|what

The geometric mean of a data set $https://upload.wikimedia.org/math/8/6/4/86409ad98d42def41b424f22e814da2c.png$ is given by:

$https://upload.wikimedia.org/math/7/5/3/753061f377ecbca16901c207e944ecb9.png$

from there, it should be pretty straight forward.

2011-02-06 21:59:34

#3

AussieReaper: ( ͡° ͜ʖ ͡°); +5,761|6204|what

Geometric mean of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 is

8.30436

2011-02-06 22:07:30

#4

TheDonkey: Eat my bearrrrrrrrrrr, Tonighttt; +163|5768|Vancouver, BC, Canada

AussieReaper wrote:
Geometric mean of 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 is

8.30436

That's the geometric mean, but how does that alter or give me the maximum common ratio in the sequences?

2011-02-06 22:15:01

#5

AussieReaper: ( ͡° ͜ʖ ͡°); +5,761|6204|what

What Geometric Sequence did you play 1 .. 20 into?

2011-02-06 22:18:33

#6

TheDonkey: Eat my bearrrrrrrrrrr, Tonighttt; +163|5768|Vancouver, BC, Canada

It asked for as many as I could find, and I got

a) 1, 2, 4, 8, 16
b) 1, 3, 9
c) 3, 6, 12

2011-02-06 23:11:26

#7

Jaekus: I'm the matchstick that you'll never lose; +957|5230|Sydney

42

2011-02-07 00:03:28

#8

TheDonkey: Eat my bearrrrrrrrrrr, Tonighttt; +163|5768|Vancouver, BC, Canada

Jaekus wrote:
42

...I don't follow...

2011-02-07 01:01:57

#9

(HUN)Rudebwoy: Member; +45|6806

^ http://en.wikipedia.org/wiki/Phrases_fr … the_Galaxy

"Answer to the Ultimate Question of Life, the Universe and Everything (42)"

2011-02-07 01:36:44

#10

Nappy: Apprentice; +151|6281|NSW, Australia

Spoiler (highlight to read):
sorry, im a complete math fail these days. totally unrelated

I did exactly 83 km/h in 51 minutes. what is my average speed?

anyone know?

2011-02-07 01:42:42

#11

Spark: liquid fluoride thorium reactor; +874|6726|Canberra, AUS

Nappy wrote:
Spoiler (highlight to read):
sorry, im a complete math fail these days. totally unrelated

I did exactly 83 km/h in 51 minutes. what is my average speed?

anyone know?

you meant 83km, right?

The paradox is only a conflict between reality and your feeling what reality ought to be.
^{~ Richard Feynman}

2011-02-07 01:58:55

#12

tazz.: oz.; +1,338|6226|Sydney | ♥

Spark wrote:
Nappy wrote:
Spoiler (highlight to read):
sorry, im a complete math fail these days. totally unrelated

I did exactly 83 km/h in 51 minutes. what is my average speed?

anyone know?
you meant 83km, right?

Nah mate - His average speed is 83km/h - lololololol.

^{everything i write is a ramble and should not be taken seriously.... _{seriously. ♥}}

2011-02-07 02:00:06

#13

tazz.: oz.; +1,338|6226|Sydney | ♥

If he did mean 83km - (83/51)x60=97.65(rounded)km/h

^{everything i write is a ramble and should not be taken seriously.... _{seriously. ♥}}

2011-02-07 03:30:58

#14

Nappy: Apprentice; +151|6281|NSW, Australia

sorry my bad, yeh 83 km... so embarrassed. i did the wrong equation the other day and got 81. i dont know what i did

Thanks though

Last edited by Nappy (2011-02-07 03:32:54)

2011-02-07 14:28:49

#15

TheDonkey: Eat my bearrrrrrrrrrr, Tonighttt; +163|5768|Vancouver, BC, Canada

Fuuu.

Since this seems to be an impossible to answer question (I've asked everywhere. I guess I'll just take the point deduction.

Thanks guys.

2011-02-07 15:26:17

#16

Trotskygrad: бля; +354|6051|Vortex Ring State

sort of forms a pascal's triangle

or maybe I'm just high

a) 1, 2, 4, 8, 16
b) 1, 3, 9
c) 3, 6, 12

1
11
121
1331
14641
15101051

2011-02-07 15:56:28

#17

AussieReaper: ( ͡° ͜ʖ ͡°); +5,761|6204|what

can't you also use fractions?

1.5
3
4.5
6
7.5
9

etc

2011-02-07 16:04:35

#18

presidentsheep: Back to the Fuhrer; +208|6013|Places 'n such

or 20, 10, 5, 2.5, 1.25, etc.
edit: maybe a bad example...
16 8 4 2 1?

Last edited by presidentsheep (2011-02-07 16:05:05)

I'd type my pc specs out all fancy again but teh mods would remove it. Again.

2011-02-07 17:53:10

#19

TheDonkey: Eat my bearrrrrrrrrrr, Tonighttt; +163|5768|Vancouver, BC, Canada

presidentsheep wrote:
or 20, 10, 5, 2.5, 1.25, etc.
edit: maybe a bad example...
16 8 4 2 1?

Those are good points, thanks!

2011-02-07 18:02:57

#20

PrivateVendetta: I DEMAND XMAS THEME; +704|6243|Roma

I refuse to post in this thread with help because both words in the thread title are spelt wrong.

https://static.bf2s.com/files/user/29388/stopped%20scrolling%21.png

2011-02-07 18:06:38

#21

AussieReaper: ( ͡° ͜ʖ ͡°); +5,761|6204|what

That's the exact attitude his English teachers took when he couldn't work out a Geometric Sequence.

BF2S Forums Math halp. (Geometric Sequences)

AussieReaper wrote:

Jaekus wrote:

Nappy wrote:

Spark wrote:

Nappy wrote:

presidentsheep wrote:

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