Answer: 
Step-by-step explanation:

Distribute the negative sign.

Remove the other parentheses.

Combine like terms.

Is the average<span> of the numbers: a calculated "central" value of a set of numbers. To calculate: Just add up all the numbers, then divide by how many numbers there are.</span>
The answer is 21.08241 because for an approximate result, multiply the length value by 1609
The correct answer is 2067