The answer is 8.4 meters.
8.4
840
It ends with a 2, so it must be rounded down to 840.
840
It is already rounded to the nearest ten as 840
It is: 1,000
145
It is: 700 because 40 is less than 50
The factors of 842 are: 1, 2, 421, 842
842.
140.3333
There are 84.2 tens in 842.