Uh, so, you're median is 81 already.
Since the middle two numbers are 82 and 80, you have to add them together and then divide by 2.
However, if you're trying to add a number in, adding 81 as it is would work as well.
Hope this helps!
3 miles is 4.8 kilometers which divided by 4 is 0.75 miles
The answer is 6.875 ish. not exact
The answer is D since
4*4=16
16*4=64
64*4=256