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

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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
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You can easily find formulas for surface area and volume of a sphere on Wikipedia. That should help you.
i tried and it didnt help
Assuming that Earth is spherical... What's the formula for volume then? Can you find and type it here?

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Other answers:

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

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