0.025 x 104
    4.9 x 10-3
6.54321 x 106
320.1 x 106
8.6300 x 105
Which of the above numbers are written incorrectly using exponential notation?  
are all expressed, in the correct fashion,  using exponential notation?
-or-
 Incorrectly written
Correctly
Written
2.96 x 104. 2