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The speed of light is estimated at 186,000 miles per second rounded to the nearest thousand miles per second.

Which one of these could be the actual speed of light?

186,789 miles per second

186,899 miles per second

185,990 miles per second

185,190 miles per second

which one?

User Zangw
by
6.4k points

1 Answer

5 votes

It was rounding to the nearest THOUSAND.

We are looking at the thousands place, keep that in mind.

Remember: everything 5 and above is rounded up, everything below 5 is rounded down.

186,789 is above 500, it is rounded to 187,000

186,899 is above 500, it is rounded to 187,000

185,990 is above 500, it is rounded to 186,000

and 185,190 is below 500, it is rounded to 185,000

Only one matches the criteria of the question:

185,990 is above 500, it is rounded to 186,000

therefore the answer is 185,990 miles per second


Have a fantastic day!


User Coykto
by
6.5k points