To write the speed of light, which is about 671,000,000 miles per hour, in scientific notation, you need to express it as a number between 1 and 10 multiplied by a power of 10.
For 671,000,000, you can write it as: \[ 6.71 \times 10^8 \]
So the correct response is: 6.71 × 10^8 (6.71 times 10 superscript 8 baseline).