anonymous
  • anonymous
1) seventy percent of the Earth's surface is covered with water. find the approximate surface area of the earth that is water 2) find the volume of the earth radius is 3963mi
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
You can easily find formulas for surface area and volume of a sphere on Wikipedia. That should help you.
anonymous
  • anonymous
i tried and it didnt help
anonymous
  • anonymous
Assuming that Earth is spherical... What's the formula for volume then? Can you find and type it here?

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anonymous
  • anonymous
sphere = (4/3) pi r 3
anonymous
  • anonymous
Right. \[4 \div 3 * \Pi * r^{3}\] What does 'r' in this formula stand for?
anonymous
  • anonymous
radius=3963
anonymous
  • anonymous
Can you do the math then? You have all the numbers! Just divide/multiply and you'll get the answer to (2).
anonymous
  • anonymous
v=28012.86
anonymous
  • anonymous
Too little. Don't forget that: \[r^{3} = r* r * r\]
anonymous
  • anonymous
62 240 377 347
anonymous
  • anonymous
2.60712493 × 1011
anonymous
  • anonymous
v=2 635.8033
anonymous
  • anonymous
The number I'm getting is roughly 260,704,193,914 cubic miles or \[2.60 x 10^{11}\] cubic miles.
anonymous
  • anonymous
(cubic because you multiplied a number of miles by a number of miles by a number of miles :))
anonymous
  • anonymous
Now off to the first question. You'll have to calculate the area in a similar fashion, then calculate the percentage of it that is water.
anonymous
  • anonymous
approximately 197,359,487mi
anonymous
  • anonymous
Square miles. The number is correct. Well done. :)
anonymous
  • anonymous
thank you

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