what is the greatest possiable error for 28000?

To determine the greatest possible error for a given number, we need to consider the precision of the number. Since you haven't specified, let's assume that the number 28000 is rounded to the nearest integer. In this case, the greatest possible error would be +0.5 and -0.5.

To calculate the greatest possible error, you would add and subtract 0.5 from the given number:

Greatest possible error = 28000 + 0.5 – (28000 - 0.5)
= 28000.5 – 27999.5
= 1

Therefore, the greatest possible error for 28000, when rounded to the nearest integer, is 1.