SOLUTION: Water covers 70.7%, or about 363�106 km2, of the earth's surface. Approximate the total surface area of the earth. (Round your answer to the nearest million.)

Question 340843: Water covers 70.7%, or about 363�106 km2, of the earth's surface. Approximate the total surface area of the earth. (Round your answer to the nearest million.)
Answer by CharlesG2(834) (Show Source): You can put this solution on YOUR website!
Water covers 70.7%, or about 363�106 km2, of the earth's surface. Approximate the total surface area of the earth. (Round your answer to the nearest million.)

363 * 106 km^2 ??? ---> no, you forgot the exponent,
it should be 363 * 10^6 km^2 (I looked it up)
70.7% approx. (approximately) = 0.707 = 363 * 10^6 km^2 = 3.63 * 10^8 km^2
363 * 10^6 is not proper scientific notation, it should be 3.63 * 10^8

0.707/(3.63 * 10^8) = 1/x
3.63 * 10^8 = 0.707x
x = 513,437,057.991513437057991513437058 non-rounded calculator result
x = 513 * 10^6 km^2 approx. = 513 million approx. km^2
x = 5.13 * 10^8 approx. km^2

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