After being exposed to an incredible shrinking machine, Halley's height decreased by 108 cm over 6 seconds. Her height decreased by the same amount each second. How much did Halley's height change each second?
1 answer
To find how much Halley's height changed each second, divide the total height decrease by the number of seconds: 108 cm / 6 seconds = <<108/6=18>>18 cm/second. Answer: \boxed{18}.