19. (a) Some health experts recommend 10,000 steps per day for a healthy lifestyle, Measure the distance of your normal step and estimate how many miles one would walk with 10,000 steps. (b) If a "double step," which is two steps, is a distance roughly equivalent to a person's height, how many double steps would you walk in a mile? (c) The word "mile" comes from the Latin word "mille," which means a thousand, because the mille was equal to the distance of a thousand double steps of a Roman soldier. If that's true, how tall was the average Roman soldier