It seems you need to move the decimal three times over, then you round the number. So the answer would be 5.5 x 10^3.
To figure out just where that earthquake happened, you need to look at
your seismogram and you need to know what at least two other
seismographs recorded for the same earthquake. You will also need a map
of the world, a ruler, a pencil, and a compass for drawing circles on
the map.
