## College Algebra (10th Edition)

$5.0\times 10^{2}$ seconds
Given that the speed of light is 186,000 miles per second, the time it takes light to cover 93,000,000 miles is $\displaystyle \frac{93,000,000}{186,000}=500$ seconds To write 500 in scientific notation, $500=5\times 100= 5.0\times 10^{2}$ seconds