Morrison Barber
08/26/2023 · Primary School
8 In the following situations define suitable variables and write an exponential equation relating the variables. a A colony of 800 penguins is decreasing by \( 15 \% \) per year. b There is a culture of 600 bacteria increasing by \( 140 \% \) per hour.
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a. 设 \( P(t) \) 为第 \( t \) 年后企鹅的数量,方程为 \( P(t) = 800 \times (0.85)^t \)。
b. 设 \( B(t) \) 为第 \( t \) 小时后细菌的数量,方程为 \( B(t) = 600 \times (2.4)^t \)。
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