6. Directions: Type the correct answer in the box. Use numerals instead of words.Using a very precise measuring device, Dr. Calvin measured the thickness of a piece of metal to be 0.00064 of a meter. Dr. Amos measured another piece to be 2.5 * 10^-5 of a meter thick.
If the doctors put the two pieces of metal on top of each other, the new piece of metal would be ___* 10^-4 of a meter thick.

Question

6. Directions: Type the correct answer in the box. Use numerals instead of words.Using a very precise measuring device, Dr. Calvin measured the thickness of a piece of metal to be 0.00064 of a meter. Dr. Amos measured another piece to be 2.5 * 10^-5 of a meter thick. 
If the doctors put the two pieces of metal on top of each other, the new piece of metal would be ___* 10^-4 of a meter thick.