Working alone, John can complete a task in 150 minutes. Kasey can complete the same task in only 120 minutes. John and Kasey wor
k together for 30 minutes and then Alicia joins in. Together they finish the task 20 minutes later. How long would it take Alicia to complete the task by herself?
Answer: The population is decreasing. We can tell from the equation because the value of the exponent of a number smaller than one decreases as the exponent value increases.