kumold

0 Questions
21 Answers

+42

0

I guess most of them doesn't know how to use a calculator...

kumoldJun 2, 2012

+42

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500*(1.05) ²⁰+500*(1.05) ¹⁹+500*(1.05) ¹⁸+500*(1.05) ¹⁷+500*(1.05) ¹⁶+500*(1.05) ¹⁵+500*(1.05) ¹⁴+500*(1.05) ¹³+500*(1.05) ¹²+500*(1.05) ¹¹+500*(1.05) ¹⁰+500*(1.05) ⁹+500*(1.05) ⁸+500*(1.05) ⁷+500*(1.05) ⁶+500*(1.05) ⁵+500*(1.05) ⁴+500*(1.05) ³+500*(1.05) ²+500*(1.05) ¹=17359.62590401641141

kumoldJun 2, 2012

+42

0

if your decimal is written as a cycle, like a.abc..zabc..zabc..z......
then there is one simple way to write it as fraction. first we'll get numbers after point
0.abc..zabc..zabc..z ...
and call it, for example, number x
so, x=0.abc..zabc..z...
ab..z is n-digit number
let's multiply each side of x=0.abc..zabc..z... to 10^n
we'll get
10^n*x=abc..z(point mark)abc..zabc..z...
10^n*x = abc..z + 0.abc..zabc..z... or 10^n*x=abc..z+x
so
10^n*x-x=abc..z
from that, we'll get our x
x=abc..z/(10^n - 1)

let me show it in example
let's write as fraction number 0.625625625625625625625625625....
here our abc..z is 625, and 625 is 3-digit number
from here

we'll use our formula x=abc..z/(10^n-1)
abc..z=625 and n=3

x=625/(10^3-1)
x=625/999
so, number 0.625625625625.... in fraction will be 625/999

kumoldJun 2, 2012

+42

0

because there is no accurate value of Pi. Pi is irrational number. Go, read up about irrational numbers in wiki. here is link http://en.wikipedia.org/wiki/Irrational_number

kumoldJun 2, 2012

+42

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this equation becomes very easy one, if you just write it like this:
(a+b)(c-d)=(a-b)(c+d), and need to prove a/b=c/d
here a=sin65
b=cos67
c=sin40
d=cos33
from (a+b)(c-d)=(a-b)(c+d) we'll get
ac-ad+bc-bd=ac+ad-bc-bd
bc-ad=ad-bc
2bc=2ad
bc=ad
ad=bc
a/b=c/d

kumoldJun 2, 2012

+42

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http://en.wikipedia.org/wiki/Quartic_function

kumoldJun 1, 2012

+42

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no. 0 neither negative nor positive number

kumoldJun 1, 2012

+42

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1/2+1/3=3/6+2/6=5/6

kumoldJun 1, 2012

+42

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y=2x
6x+y=16
Use the first equation to substitute for y in the second equation.
6x+_=16
Solve the resulting equation for x.
y=2x
6x+y=16

y=2x
6x+2x=16 ==> x=2

Substitute the x-value to get the corresponding y-value.
y=2x
y=2(2)=4
Check both values in each of the original equations.
y=2x
4=?2(4)
equal

6x+y=16
6(2)+4=?16
16=?16
equal
____________
So, the ordered pair (2,4) is the solution of the system.

kumoldJun 1, 2012

+42

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total cost of rent is 44*30=$1320
cost per person if 60 people go on the trip
1320/60=$22

kumoldJun 1, 2012