Coal mines have shafts that can be as much as 7^3 feet deep. About how many feet deep into the Earth's crust are these shafts?

Answer:

343

Step-by-step explanation:

7 x 7 = 49

49 x 7 = 343

The coal mines is 343 feet deep into the Earth's crust are these shafts.

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

Given that Coal mines have shafts that can be as much as 7³ feet deep.

We need to find about  how many feet deep into the Earth's crust are these shafts.

From the given it is 7³ feet deep.

So let us find the value of 7³

7×7×7

49×7

Forty nine times of seven

343

Three hundred and forty three.

So the coal mines is 343 feet deep into the Earth's crust are these shafts.

Hence, the coal mines is 343 feet deep into the Earth's crust are these shafts.

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