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Math 7 Discussion

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164
chuche
07-03-2019
12:23 PM ET (US)
chumpak lal
163
patricio reyes
04-30-2019
11:10 AM ET (US)
very good , thanks :)


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162
01012
04-24-2019
10:12 AM ET (US)
Do numbers really represent the physical reality?
For example 1 apple simply tells us that there is only one apple. Now it becomes complicated when simple arithmetic formulaes are applied.
Example: 1 apple x 1 apple = 1 apple. Now I don't know where the other apple got lost.
161
Joe J
03-21-2019
05:41 AM ET (US)
How to calculate future value when compounding happens every 5 years? If I use 0.2 for n in this formula, would that be correct?

A = P (1 + r/n) (nt)
160
EmberCult
09-14-2018
08:57 AM ET (US)
compute the inverse Laplace transformation of the following equation.


\begin{align*}
f(s)&=\frac{A}{\prod_{i=1}^{L}(s+a_i)^m} \ &=\frac{A}{(s+a_1)^m\,(s+a_2)^m\cdots (s+a_L)^m}.
\end{align*}

What I managed to get is this
\begin{align*}
Y^{-1}(\frac{1}{(s+a)^m})&=\frac{t^{m-1}e^{-at}}{{(m-1)!}}
\end{align*}

How do I find the Laplace inverse of the series though?
Someone suggested me using partial fraction decomposition and gave me this solution, \begin{align*}f(s)=\sum_{1\le k\le m\atop 1\le j\le L} {A_{jk}\over(s+a_j)^k}\end{align*}
But failed to tell how did we achieve it.
159
lrmailPerson was signed in when posted
10-10-2017
07:13 AM ET (US)
Hi,

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158
TV Shqip
10-07-2017
08:41 PM ET (US)
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157
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05-17-2017
10:49 PM ET (US)
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12-01-2016
02:51 PM ET (US)
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11-03-2016
11:16 PM ET (US)
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154
sidney 01
09-23-2016
11:57 AM ET (US)
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153
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08-31-2016
11:31 AM ET (US)
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152
marcelo01
08-26-2015
04:32 PM ET (US)
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151
sidneysilva
05-17-2015
10:32 PM ET (US)
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150
como bajar de peso
03-24-2015
09:39 AM ET (US)
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149
suplementos alimentares
03-24-2015
09:30 AM ET (US)
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Edited 03-24-2015 09:31 AM
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