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Express the following quantities in the scientific notation: According to NASA, Mars is 225,000,000 km from the Sun at its closest point

Express the following quantities in the scientific notation:

According to NASA, Mars is 225,000,000 km from the Sun at its closest point.
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scientific notation needs to re-written as 2.25x10 to a power. exponents always confuse me, but my answer has to equal 225,000,000. so 10 to the second power is 100. it also has 2 zeroes after the one. 1000 is ten to the hird power (3 zeroes after the ones. 100,000,000 would therefore be 10 to the 8th power. so, the answer is 2.25 x 10 to the eighth power :)
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Express the following quantities in the scientific notation: According to NASA, Mars is 225,000,000 km from the Sun at its closest point
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