The speed of light is approximately 3x10^8 meters per second. the speed of sound is approximately 3x10^2 meters per second. if you were standing 900 meters away from a firework show, how long would it take for you to see the fireworks? how about to hear them?

To see: 3 micro seconds (0.000003 seconds)
To hear: 3 seconds

Understanding what? lol

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.