? A. B. C. D. E. 1.The amount of charge on a capacitor in anelectric circuit decreases by 30% each second.
   ?    A    B    C    D    E      2.Polluted water is passed through a series of filters. Each filterremoves all but 30% of the remaining impurities from the water.
   ?    A    B    C    D    E      3.In 1950, the population of a town was 3000 people. Over the courseof the next 50 years, the town grew at a rate of 10% perdecade.
   ?    A    B    C    D    E      4.The percent of a lake's surface covered by algae, initially at 35%,was halved each year since the passage of anti-pollution laws.
   ?    A    B    C    D    E      5.In 1950, the population of a town was 3000 people. Over the courseof the next 50 years, the town grew at a rate of 250 people peryear.
A. ?(?)=?(0.3)?f(x)=B(0.3)x
B. ?(?)=?(2)−?f(x)=A(2)−x
C. ?(?)=?0+??f(x)=P0+rx
D. ?(?)=?(0.7)?f(x)=B(0.7)x
E. ?(?)=?0(1+?)?f(x)=P0(1+r)x
