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Mathematics 18 Online
OpenStudy (anonymous):

How do you find the volume of a sphere?

OpenStudy (juicstice):

4/3(pi)(r)cubed

OpenStudy (_michaeld22):

\[V=\frac{ 4 }{ 3 } \pi r ^{3}\]

OpenStudy (anonymous):

^ and ^^ are correct

OpenStudy (anonymous):

what do i plug in ?

OpenStudy (_michaeld22):

What information does it give you?

OpenStudy (anonymous):

well we dont know the measurements or anything so could you please gives us some

OpenStudy (anonymous):

The Radius is 15cm

OpenStudy (anonymous):

well r=radius

OpenStudy (anonymous):

so plug that number into the equation where r is and solve

OpenStudy (anonymous):

do i do 15*pi

OpenStudy (_michaeld22):

Exponents first, right Jon? So \[r ^{3}\]

OpenStudy (anonymous):

yes which would be \[15^{3}\]

OpenStudy (_michaeld22):

So 15*15*15 = ?

OpenStudy (anonymous):

yes @Quuen_Si please solve that for now

OpenStudy (anonymous):

i got 3375

OpenStudy (_michaeld22):

\[3375\pi\]

OpenStudy (_michaeld22):

What's your answer?

OpenStudy (anonymous):

yes so multiply 3375 by 4/3 first

OpenStudy (_michaeld22):

Am I doing this right Jon? Correct me if I'm wrong.

OpenStudy (anonymous):

i recommend multiplying by the fraction first to get the most accurate answer

OpenStudy (_michaeld22):

Oh, I always did the fraction last, and in a different way. I've always done the number*pi first, then the fraction.

OpenStudy (anonymous):

well you get pretty much the same answer but some people use 3.14 instead of all of pi... thats why i recommend using the fraction first because it doesnt mess up the rest of the equation

OpenStudy (anonymous):

btw @_Michaeld22 danni is on

OpenStudy (_michaeld22):

Lol yeah, I saw. So @Quuen_Si, what answer did you get for 4/3*3375

OpenStudy (anonymous):

4500

OpenStudy (_michaeld22):

Yes, now 4500*pi, or 3.14, whichever you prefer.

OpenStudy (anonymous):

yes now multiply by full pi or 3.14 ^

OpenStudy (anonymous):

round final answer if need be

OpenStudy (anonymous):

14130

OpenStudy (_michaeld22):

Yup. Final answer is: \[14130(units)^{}\]

OpenStudy (anonymous):

units cubed

OpenStudy (_michaeld22):

Sorry that was supposed to be units cubed

OpenStudy (_michaeld22):

Thanks for helping Jon. Lol.

OpenStudy (anonymous):

NO thank you

OpenStudy (anonymous):

im off now

OpenStudy (dan815):

you can do volume of cylinder = the volume under the cone

OpenStudy (anonymous):

???

OpenStudy (dan815):

-*

OpenStudy (dan815):

:)

OpenStudy (anonymous):

ok...

OpenStudy (dan815):

wut

OpenStudy (dan815):

u know what i mean dont u !!

OpenStudy (dan815):

|dw:1401590875926:dw|

OpenStudy (anonymous):

dan please stop i keep getting notifications and it is quite annoying...

OpenStudy (dan815):

ok sry

OpenStudy (anonymous):

thanks... and yes i know what you mean but it is a longer process

OpenStudy (dan815):

integration way

OpenStudy (anonymous):

ya... ok im gonna leave this question now...

OpenStudy (dan815):

ok

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