Joan writes four numbers on the board in standard form, and then she writes their scientific notation. The table below shows her numbers. Joan’s numbers row number in standard form number in scientific notation 1 7,100 7. 1 mc021-1. Jpg 103 2 –0. 000041 –4. 1 mc021-2. Jpg 10–5 3 –39,000 –3. 9 mc021-3. Jpg 104 4 120,000 1. 2 mc021-4. Jpg 106 in which row of the table did joan make a mistake in writing the scientific notation?.