How many miles to earth's core?

Answer 1

That's really the mean radius of the Earth, which is about #"6371 km"#. You may have used that number in physics.

To translate it into miles:

#6371 cancel"km" xx (10^5 cancel"cm")/(1 cancel"km") xx (1 cancel"in.")/(2.54 cancel"cm") xx (1 cancel"ft.")/(12 cancel"in.") xx "1 mi."/(5280 cancel"ft.")#

#~~ color(blue)" 3958.76 mi"#

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Answer 2

Ariana Acosta

The distance between the Earth's surface and its core is roughly 3,958 miles (6,371 kilometers).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.