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anonymous

  • 5 years ago

If the volume of a sphere is 18 cm cubed, what is the radius?

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  1. anonymous
    • 5 years ago
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    V = 4/3 pi r^3. find r from that.

  2. anonymous
    • 5 years ago
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    Volume = 4/3 pi r^3 find r using that formula.

  3. anonymous
    • 5 years ago
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    omg but i need to know the radius.

  4. anonymous
    • 5 years ago
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    And you can find it, just work backwards. Plug in the volume you are given and solve for r.

  5. anonymous
    • 5 years ago
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    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

  6. anonymous
    • 5 years ago
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    what?

  7. anonymous
    • 5 years ago
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    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

  8. anonymous
    • 5 years ago
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    khanacademy.org has good videos demonstrating how to do this.

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