Lynn walked on a moving sidewalk at an airport walking in the same direction as a sidewalk she traveled at an average of 2.5 meters per second when she walked against the motion of the sidewalk she took 24 seconds longer to travel the same length averaging 1.3 m per second if lynn maintain the same walking pace in both directions what is the length of a moving sidewalk

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.