Iwill mark brainiest can some1 explain this to me the corrrect answer is 87000 bu i dont get it

The math is pretty straightforward evaluation of the arithmetic.
3000√32/0.196
= 3000*5.656854/0.196
= 16970.5627/0.196
= 86,584.5

Then you are asked to round this value to the nearest 1000.

There are a couple of ways you can round to the nearest 1000. One of them is this:
.. a) add half a thousand (500)
.. .. 87,084.5
.. b) set every digit to the right of the 1000s digit to zero
.. .. 87,000


The other way to round to the nearest 1000 is to look at the 100s digit (5). If it is 5 or more, which it is, increase the 1000s digit by 1. That makes the 1000s digit increase from 6 to 7. Now, make all the digits to the right of the 1000s digit be zero. You have
.. 87,000