All Answers 358177 Answers

+42

0

there should be conditions:
r+4>0
r>0
r+1>0 --->r>0

kumoldJun 8, 2012

+42

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it means that 10 ^{1+1.36437635384187i}=-10
here i = (-1)^1/2

kumoldJun 8, 2012

+42

0

kumoldJun 8, 2012

+42

0

whole part of 3.14 is 3

kumoldJun 8, 2012

+42

0

Depends on what kind of calculator you have.

kumoldJun 8, 2012

+42

0

kumoldJun 8, 2012

Jun 7, 2012

0

Simplify as much as possible.

GuestJun 7, 2012

+30

0

But if the dice are ordinary, then how is one biased..?

FlexographyJun 7, 2012

+30

0

Quote:
What is the approximate height of the person casting this shadow? (rounded to the nearest hundredth?)
A=74 degrees a= ?
B=16 degrees b= 21 ft.
C=90 degrees c= ? (hypotenuse)

Alright, well the answer I got was 73 ft, which seems like an unlikely height for a person, but here's how I did it:

1) I drew a picture of the triangle (which I would upload, but I can't access any image uploading sites from school)

2) I used Sine law to find the height

a/SinA = b/SinB
a/Sin74 = 21/Sin16
a = (21)Sin74/Sin16
a = [input](21(Sin(74)))/Sin(16)[/input]

FlexographyJun 7, 2012

+3146

0

Guest:
radius of 115 cm

Guest:
a)what is the surface area of the balloon? answer correct to one decimal place?

A=4*Pi*r^2
[input]4*Pi*(115)^2[/input]
A=166190.3cm^2

Guest:
b)after a few days the balloon deflates to a radius of 10cm. what has the surface area shrunk to?

[input]4*Pi*(10)^2[/input]
A=1256.6cm^2

Guest:
c)if the surfce area shrinks to 1000cmsquare, what will the radius be?

A=4*Pi*r^2
A/(4*Pi)=r^2
r=sqrt( A/(4*Pi) )
[input]sqrt( 1000/(4*Pi) )[/input]
r=8.9cm

adminJun 7, 2012

+42

0

Vertical asymptote is x=3
and Oblique asymptote is y=1-x, which is found like this:
y=(-x ²+4x+3)/(x-3)=-x+1+6/(x-3)
since 6/(x-3) <> 0, y=-x+1+6/(x-3) <>-x+1

kumoldJun 7, 2012

0

priscilla:
tamara brings home from the fete a perfectly shperical balloon that has a radius of 115 cm.
a)what is the surface area of the balloon? answer correct to one decimal place?
b)after a few days the balloon deflates to a radius of 10cm. what has the surface area shrunk to?
c)if the surfce area shrinks to 1000cmsquare, what will the radius be?

GuestJun 7, 2012

Jun 6, 2012

0

2 can be written as square root of 2, times the square root of 2.
meaning we have the square root of plus or minus 2 times the square root of plus or minus 2.
the square root of minus two times the square root of minus 2 = 2

square root of minus 2 = 2i

now 2i times 2i = 2i squared

now we can put this answer with the original question giving us=

2i squared < 2+2

now 2+2 can be written as A+A
and 2i squared can be written as 2B squared

so the equation can be represented as

2B squared < A+A or (1B squared + A) (1B squared - A)

now we kneed an answer so we will give that value the term x

1B squared + A) (1B squared - A)=x or 1B squared + A) (1B squared - A)/x=0

therefore 2+2 = 0

fool of a took

GuestJun 6, 2012

+42

0

for decomposition to fractions, firstly we need to find roots of equation 6x ²+7x-3=0
Discriminant of equation
D=49+72=121=11 ²
roots:
x _1/2=(-7±11)/12= -3/2 and 1/3
so, second-degree polynomial 6x ²+7x-3 can be written as 6(x+3/2)(x-1/3) or (2x+3)(3x-1)
from there fraction 22/(6x^2+7x-3)=22/(2x+3)(3x-1) can be written as
22/(2x+3)(3x-1)=a/(2x+3)+b/(3x-1)
now let's find a and b
a/(2x+3)+b/(3x-1)=(a(3x-1)+b(2x+3))/(2x+3)(3x-1)=(3ax-a+2bx+3b)/(2x+3)(3x-1)=(x(3a+2b)+3b-a)/(2x+3)(3x-1)
here we get set of equations:
3a+2b=0
3b-a=22

3a+2b=0
a=3b-22

3(3b-22)+2b=0
a=3b-22

9b-66+2b=0
a=3b-22

11b=66
a=3b-22

b=6
a=3*6-22=-4

so, fraction decomposition of 22/(6x^2+7x-3) will be 6/(3x-1)-4/(2x+3)

kumoldJun 6, 2012

+42

0

16 ^(x-4) = 9 ^(-9x)
log ₁₀ 16 ^(x-4) = log ₁₀9 ^(-9x)
(x-4) log ₁₀ 16=-9x log ₁₀ 9
x(log ₁₀ 16 + 9 log ₁₀ 9)=4 log ₁₀ 16
xlog ₁₀ (16*9 ⁹)=4 log ₁₀ 16
x=4 log ₁₀ 16/log ₁₀ (16*9 ⁹)

kumoldJun 6, 2012

+42

0

what do you mean by "make fractions"?

kumoldJun 6, 2012

Jun 5, 2012

+3146

0

[input]1/2+3/2+1 1/2[/input]

adminJun 5, 2012

Jun 4, 2012

+3146

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[input]data=(5, 7, 2, 4, 9, 3); xs=sum(data[x],x=1..6)/6; sqrt( 1/(6-1)* sum( (data[x]-xs)^2 ,x=1..6) )[/input]

adminJun 4, 2012

+30

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I've never encountered the term 'standard deviation', but mean is:

[input](5+7+2+4+9+3)/6[/input]

FlexographyJun 4, 2012

+4

0

Can you be more specific please?
One definitely needs some more details to solve this one.

DelgadoJoanneJun 4, 2012

+4

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It is 7, that's right!

DelgadoJoanneJun 4, 2012

+2

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1/s'=-(1/f+1/s)
=-(1/15+1/12)
=-9/60

s'=-20/3 cm

h'/h=|s'/s|
<=> h'/4.5=|(-20/3)/12|
<=> h'=2.5 cm
Its unreal shadow
Next time, dont ask pure phisics in this forum. Maybe, no body respond you

TheWewOneJun 4, 2012

Jun 3, 2012

+3146

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adminJun 3, 2012

+3146

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Guest:
5

no, that's 2+2.

adminJun 3, 2012

0

GuestJun 3, 2012

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