anonymous
  • anonymous
If the volume of a sphere is 18 cm cubed, what is the radius?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
V = 4/3 pi r^3. find r from that.
anonymous
  • anonymous
Volume = 4/3 pi r^3 find r using that formula.
anonymous
  • anonymous
omg but i need to know the radius.

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anonymous
  • anonymous
And you can find it, just work backwards. Plug in the volume you are given and solve for r.
anonymous
  • anonymous
the equation for the volume of a sphere is (4*Pi*r)/3 solve for r by moving 3/(4*pi) to the other side of the equation so you get r^3 = (3*18)/(4*pi) simplify
anonymous
  • anonymous
what?
anonymous
  • anonymous
if V = 4/3 pi r^3, then multiply both sides by 3/4 3/4V = pi r^3 divide both sides by pi r^3 = (3/4pi) V r = cube root of (3/4 pi) V, substitute V = 18 for your answer. Also, learn manipulation of equations. http://www.chem.tamu.edu/class/fyp/mathrev/mr-algeb.html
anonymous
  • anonymous
khanacademy.org has good videos demonstrating how to do this.

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