All Answers

+3146

tkhan:
In how many ways can three black

tkhan:
a box contains 12 black

that's 3 out of 12.

do you already know nCr (from n choose r)? nCr = n! / r!*(n-r)!
[input]n=12; r=3; n! / (r!*(n-r)!)[/input]
[input]ncr( 12, 3)[/input]

for green:

tkhan:
two green be picked

and

tkhan:
and 8 green marbles

that's 2 out of 8.
[input]ncr( 8, 2)[/input]

combinations combined (multiplied):
[input]ncr( 12, 3) * ncr( 8, 2)[/input]

adminMay 18, 2012

+3146

[input]data=(23, 26, 28, 19, 10, 38, 37, 24, 25); xs=sum(data[x],x=1..9)/9; sqrt( 1/(9-1)* sum( (data[x]-xs)^2 ,x=1..9) )[/input]

adminMay 18, 2012

+3146

[input]-x^2 + 3x - 2 = 0[/input]

[input]plot( -x^2 + 3x - 2, x= 0..4)[/input]

adminMay 18, 2012

+3146

Guest:
find two positive numbers whose difference equals 4

x-y=4

Guest:
and whose product equals 25

x*y=25

[input]solve( x-y=4, x*y=25 )[/input]

Guest:
find two positive numbers

y=sqrt(29)+2
x=25/(sqrt(29)+2)

adminMay 18, 2012

+3146

[input]-18+470[/input]

adminMay 18, 2012

+3146

[input]1 + 1[/input]

adminMay 18, 2012

+3146

6/x+4=6 | -4
6/x+4-4=6-4
6/x+0=2
6/x=2 | *x
6/x*x=2*x
6/1=2x
6=2x | :2
6/2=2x/2
3=1x
x=3

[input]6/x+4=6[/input]

adminMay 18, 2012

I agree with the first answer: 0.03. The problem statement is ambiguous. It's either:

(three times 10) to the negative 2 power

or

three times (10 to the negative 2 power)

In the absence of parentheses, the default order of operations is exponentiation first, followed by multiplication, so 10 is raised to the -2 power, and then multiplied by 3.

GuestMay 18, 2012

that is grade 8 mathe dude

GuestMay 18, 2012

dude, lay off the deutsch, this is america.

GuestMay 18, 2012

May 17, 2012

+3146

bee:
compounded continuously

nice.

[input]725*(lim( (1+(4.5/100)/x)^x , x=inf ))^3[/input]

829.789168654703004

adminMay 17, 2012

+3146

[input]2/3+n+6=4[/input]

adminMay 17, 2012

that makes plenty of sense. thank you.

GuestMay 17, 2012

+35

It would take a while to explain, but it is 588. Tell every to look at the question "i fun fact". You look at it as well.

MathiMay 17, 2012

+35

The answer in decimal format is 1/900. Look at the question "i fun fact". Tell everyone else to look at "i fun fact" as well.

MathiMay 17, 2012

+35

Comment "Help" if you would like a hint.

MathiMay 17, 2012

+35

Comment "Help" if you would like a hint.

MathiMay 17, 2012

+35

TESTING

MathiMay 17, 2012

Tell everyone to look at the question "i fun fact"

GuestMay 17, 2012

Don't waste our time. It's 2 just for the record

GuestMay 17, 2012

The answer is -(2+2/3). This is how to work it out. From the rules of the commutative property, we can switch the 6 and the n around. 6+2/3=6 and 2/3. So now you have 6 and 2/3+n=4. Well, 6 and 2/3+-(2+2/3)=4, so n=-(2+2/3).

GuestMay 17, 2012

Question NOT clear; you say 'you can't use decimal'. Does it mean that you want avoid decimal or not allowed to express the result in decimal? If you REQUIRE specific or exact value then you CAN'T AVOID decimal. But if want to simplify or evaluate an expression, then you can avoid. In this situation:

Sqrt14=sqrt2*sqrt7. Satisfied?

GuestMay 17, 2012

May 16, 2012

+10

SOH CAH TOA
sine, opposite, hypoteneus,

cosine, adajcent, hypoteneus

Tangent, Opposite, Adjacent

use a calculator sin, cos, and tan are one of scientific buttons.

chokahoMay 16, 2012

john:
what is *square root* 2x=6?

[input]

John, remember that the square root of 2x = (2x)^1/2 so you had to multiply both sides by the power of 2 to simplify.

GuestMay 16, 2012

z.B. 1,5

sind z.b. 3/2
also Kehrwert 2/3

Bsp: 2,5
=5/2
kehrwert: 2/5

GuestMay 16, 2012

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