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Cant get this math.
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Baggins
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O.P. Cant get this math.
I have to write expressions for patterns.
example:
Pattern: 8, 13, 18, 23, 18, 33
Description: Start at 8 then add 5.
Expression: n5+3

There are two patterns that I couldn't figure out, and nither could my teacher when I asked her.

1.
Pattern: 3, 6, 10, 15, 21
Description: Start at 3, then add 3, next add 4 and so on and so forth.
Expression: ???

2.
Pattern: 8, 16, 32, 64, 128
Description: Start at 8, then multiply by 2.
Expression: ???

Please help. :)

This post was edited on 04-27-2008 at 11:46 AM by Baggins.
04-27-2008 11:07 AM
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John Anderton
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RE: Cant get this math.
1) Start at 3; Add 3, then 4 then 5...
q=p+(3+n)
Where q = current answer (ie nth value)
and p = previous answer (ie (n-1)th value)
Initialise n=0 and p=3

4) Indices of 2 starting from 8
q=p*2
Initialise p = 8
Or, q=2^(n+3) ;)

quote:
Originally posted by Bilbo
8, 16, 32, 64, 182
More like 128 ;)
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04-27-2008 11:26 AM
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Phillip
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RE: Cant get this math.
quote:
Originally posted by Bilbo
There are two patterns that I couldn't figure out, and nither could my teacher when I asked her.

Wow your math teacher must be kinda stupid =\
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04-27-2008 11:39 AM
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Th3rmal
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RE: Cant get this math.
quote:
Originally posted by Phillip
quote:
Originally posted by Bilbo
There are two patterns that I couldn't figure out, and nither could my teacher when I asked her.

Wow your math teacher must be kinda stupid =\
incredibly, if the teacher doesnt understand it, then why is she giving them these questions without knowing how to do it first?
You have the intellect comparable to that of a rock. Be proud.
04-27-2008 11:41 AM
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Baggins
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O.P. RE: Cant get this math.
I'm still in grade 8, it's not like all the teacher does is math. In fact, she does everything but french.

EDIT:
JA: You're supposed to be able to do it with only n, without knowing the previous number.

This post was edited on 04-27-2008 at 11:45 AM by Baggins.
04-27-2008 11:43 AM
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Th3rmal
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RE: Cant get this math.
quote:
Originally posted by Bilbo
I'm still in grade 8, it's not like all the teacher does is math. In fact, she does everything but french.
you rock, but the teacher should know how to do the equations...
You have the intellect comparable to that of a rock. Be proud.
04-27-2008 11:47 AM
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Baggins
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O.P. RE: Cant get this math.
also, JA.

quote:
Originally posted by JA
q=2^(n+3)
it's q=2^(n+2)
04-27-2008 11:59 AM
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markee
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RE: Cant get this math.
1)  p = (n+2)(n/2+1.5)

I realise it isn't the easiest to find, but it shouldn't take a maths teacher more than 5min... And where was the class nerd to anser this one?
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04-27-2008 12:11 PM
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Baggins
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O.P. RE: Cant get this math.
quote:
Originally posted by markee
1)  p = (n+2)(n/2+1.5)

I realise it isn't the easiest to find, but it shouldn't take a maths teacher more than 5min... And where was the class nerd to anser this one?
Thanks, and just ftw I am the class nerd.

Also, like I said before she doesn't do just math, she teaches all our subjects.

markee: using yours, if n=4 then p=21. It should = 23.

This post was edited on 04-27-2008 at 12:26 PM by Baggins.
04-27-2008 12:22 PM
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andrey
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RE: Cant get this math.
quote:
Originally posted by markee
p = (n+2)(n/2+1.5)
eh ? :p

much easier:

n(n+1)
   2

for n=1,2,3...

The sequence begins with 1, i.e. 1, 3, 6, 10, 15, 21, 28 etc.

(Triangular numbers btw.)

This post was edited on 04-27-2008 at 01:13 PM by andrey.
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04-27-2008 12:43 PM
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