Jesse E. answered • 08/27/19
Tutor
4.6
(8)
Masters in Chemistry and Bachelors in Biology
Imagine this number with a decimal point:
438904.0
If you move the decimal point to the left, the exponent used will be positive. If you move it to the right, the exponent will be negative. The number of times you move the decimal is the number you put in the exponent.
With this problem, assuming you want three significant figures, the number becomes:
4.39 x 105 mm
because we move to the left, the positive direction, 5 units.
