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#2
+118725
0
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
------------------------------------------------------------------------------------------------------------------
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.
Melody
Nov 17, 2013
#2
+118725
0
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
Melody
Nov 17, 2013
#1
+118725
0
you will need to give more information than that. I don't understand.
Melody
Nov 17, 2013
#1
+118725
0
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.
Melody
Nov 17, 2013
#1
+118725
0
3x - 5 = 1
Melody
Nov 17, 2013
#1
+118725
0
6a^23b^6/4a^3bc^3
=( 6a
23
b
6
/4) * a
3
bc
3
This is the question that you have asked. Is it what you really meant?
Melody
Nov 17, 2013
#1
0
1 1/8
Guest
Nov 17, 2013
Nov 16, 2013
#1
0
please express as a 1:999999999999 type answer
Guest
Nov 16, 2013
#1
0
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
Guest
Nov 16, 2013
#1
+2
0
Sorry i forgot to register before posting this question.
Thank you
demsy11
Nov 16, 2013
#1
+118725
0
int(sin(x^2), x)
I don't know this notation at all
Is it possible that it means
Find the integral of sin
2
x with respect to x ?
I will answer this one anyway
sin
2
x = 1 - cos
2
x
sin
2
x = 1 - [ (cos(2x) + sin
2
x ]
sin
2
x = 1 - (cos(2x) - sin
2
x
2sin
2
x = 1 - (cos(2x)
sin
2
x = 1/2 - [cos(2x) / 2]
integral of sin
2
x = x/2 - sin(2x)/4
integral of sin
2
x = [2x - sin(2x) ] / 4
Now, is that what you wanted?
Melody
Nov 16, 2013
#2
+8
0
push shift button and 3
ghas1965
Nov 16, 2013
#1
+118725
0
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.)
Melody
Nov 16, 2013
#4
+118725
0
Pi is an irrational number. It can not be expressed exactly as a fraction or as a decimal - not even a recurring decimal.
Melody
Nov 16, 2013
#1
+118725
0
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.
Melody
Nov 16, 2013
#2
+118725
0
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
Melody
Nov 16, 2013
#6
+8
0
ally will sell each piece at price of 29.95, total gross351 and ally will profit 234 dollars. math is FUN!!!!
ghas1965
Nov 16, 2013
#2
+8
0
-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.
ghas1965
Nov 16, 2013
#1
+8
0
answer is 37
ghas1965
Nov 16, 2013
#1
0
2
Guest
Nov 16, 2013
Nov 15, 2013
#1
0
7x^3+x^2-7x-1=(7x+1)(x+1)(x-1)=0
x={-1/7,-1,1}
Guest
Nov 15, 2013
#3
0
no really,you don't actually remember that much. it is next to impossible. and i did say no copying off the internet
Guest
Nov 15, 2013
#2
0
(113.98 * 9) / 100 = 10.2582
Guest
Nov 15, 2013
#1
0
Use the "+/-" key directly under the "2". Press it after you enter the number whose sign you want to change.
Guest
Nov 15, 2013
#1
0
7
Guest
Nov 15, 2013
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