Answer
positive power of 10
Work Step by Step
The length of an Olympic marathon is $42.195$ kilometers.
Each kilometer is equivalent to $100,000$ centimeters.
Thus, the length of the Olympic marathon in centimeters is:
$=42.195 \times 10,000
\\=4,219,500$
Since the measurement involves a big number, then its equivalent scientific notation must have a positive power of 10.