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+118742

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if a diameter of a pipe is 200mm
the velocity is 0.25m square per second, what is the length of the pipe? I know L=V/Pirexponent 2
But I don't understand how people get 7.958 m when i get 0.0000079577471546

I used to find the cross sectional area: (Pi/4)* D (200^2).
then 0.25 was divided by the result to get 0.0000079577471546.

other gor a positive result 7.958.m
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first i will admit that i have no knowledge to this stuff.
Why does the pipe have to be any particular length? This is a serious question. Can you answer it?
BUT
could it be that the 200 is in mm and the 0.25 is in metres/s ²
so it 200mm is put in as 0.2m I think your quandrey will be overcome.

MelodyNov 17, 2013

+118742

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odds of hitting 1/38 chance 3 times in a row

1 in 38 ³ = 1 in 54872 = 1/54872

or

1 to 54871 = > 1 : 54871

MelodyNov 17, 2013

+118742

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you will need to give more information than that. I don't understand.

MelodyNov 17, 2013

+118742

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What is 4.60x10^-14 / 9.11x10^-31 =

= [ 4.60x10 ^-14 / 9.11 ] x 10 ^-31

=5.049 * 10 ^-46 (correct to 4 significant figures)

The real meaning of this type of question is often ambiguous. You really do need to use bracket.

MelodyNov 17, 2013

+118742

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MelodyNov 17, 2013

+118742

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6a^23b^6/4a^3bc^3

=( 6a ²³b ⁶/4) * a ³bc ³

This is the question that you have asked. Is it what you really meant?

MelodyNov 17, 2013

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GuestNov 17, 2013

Nov 16, 2013

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please express as a 1:999999999999 type answer

GuestNov 16, 2013

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well you do:

5 x 10 to the power of how many 0's it has, so:

5 x 10 to the power of 2

GuestNov 16, 2013

+2

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Sorry i forgot to register before posting this question.

Thank you

demsy11Nov 16, 2013

+118742

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int(sin(x^2), x)

I don't know this notation at all
Is it possible that it means
Find the integral of sin ²x with respect to x ?

I will answer this one anyway

sin ²x = 1 - cos ²x

sin ²x = 1 - [ (cos(2x) + sin ²x ]

sin ²x = 1 - (cos(2x) - sin ²x

2sin ²x = 1 - (cos(2x)

sin ²x = 1/2 - [cos(2x) / 2]

integral of sin ²x = x/2 - sin(2x)/4

integral of sin ²x = [2x - sin(2x) ] / 4

Now, is that what you wanted?

MelodyNov 16, 2013

+8

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push shift button and 3

ghas1965Nov 16, 2013

+118742

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6 factorial is written as 6!

And
6! = 1*2*3*4*5*6 = 720 (they are multiply signs)

It is used a real lot when working out probabilities.

The is even a factorial button on your calculator ! (you probably have to press 'shift' first.)

MelodyNov 16, 2013

+118742

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Pi is an irrational number. It can not be expressed exactly as a fraction or as a decimal - not even a recurring decimal.

MelodyNov 16, 2013

+118742

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the base on a baseball diamond are 90 feet apart. how far is it from home plate to second base?

A base ball diamond is a square isn't it?
so all the angles are 90 degrees
you have the 2 short sides, so I think you want the hypotenuse.
Use Pythagoras's Theorem.

MelodyNov 16, 2013

+118742

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The equation is 7x^3+x^2-7x-1=0

Using the rational root theorum
all possible rational roots will be +-factors of -1 divided by +-factors of 7
that is +1, -1, +1/7, -1/7
They are the only posible RATIONAL roots
Sub x=+1 into the LHS

LHS=7+1-7-1 = 0 therefore x=1 is a solution so (x-1) is a factor
Try x=-1
LHS=-7+1+7-1=0 therefore x=-1 is alsot a solution so (x+1) is also a factor
Try x=1/7
LHS = 1/7 ²+1/7 ²-1+1 not 0 so not helpful
Try x=-1/7
LHS = -1/7 ²+1/7 ²+1-1 = 0 so x=-1/7 is a solution so x=-1/7 is a solution so (x+1/7) is also a factor
I know now that I have all the factors because when I multiply them all together the highest power of x is 3 which is correct

so
7x^3+x^2-7x-1 = k(x+1/7)(x-1)(x+1) so k=7 (because that's what is the coefficient of x^3)
7x^3+x^2-7x-1 = 7(x+1/7)(x-1)(x+1)

The solutions will be x=-1/7,x=1 and x=-1

Normally there are more than 4 possible rational roots (and often some other roots that are irrational) so I would normally just find one of them and then use synthetic division before looking for the next one. This you tube clip is on synthetic division.
http://www.youtube.com/watch?v=_zl63HL7Npw

MelodyNov 16, 2013

+8

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ally will sell each piece at price of 29.95, total gross351 and ally will profit 234 dollars. math is FUN!!!!

ghas1965Nov 16, 2013

+8

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-5y+3=2(4y+12) -5y+3=8y+24 -5y-8y=24-3 -13y=21 -13y/-13=21/-13 Answer is y=21/-13. Dont need no money, just learn math its fun.

ghas1965Nov 16, 2013

+8

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ghas1965Nov 16, 2013

0

GuestNov 16, 2013

Nov 15, 2013

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7x^3+x^2-7x-1=(7x+1)(x+1)(x-1)=0
x={-1/7,-1,1}

GuestNov 15, 2013

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no really,you don't actually remember that much. it is next to impossible. and i did say no copying off the internet

GuestNov 15, 2013

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(113.98 * 9) / 100 = 10.2582

GuestNov 15, 2013

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Use the "+/-" key directly under the "2". Press it after you enter the number whose sign you want to change.

GuestNov 15, 2013

0

GuestNov 15, 2013

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