River Frogs:Use the information and graph below to answer the question. A non-native species of snake appeared in a large southern swamp in 1995. Shortly thereafter, scientists noticed that a particular species of river frog began to decline exponentially. They suspected that the snakes were eating the frogs at an alarming rate. The scientists made an exponential model to predict the decline in the frog population. The points plotted below come from their exponential model. Note thatt

is measured in years, the valuet=0

corresponds to 1995 and the valuet=1

corresponds to 1996, andy

is the predicted number of remaining frogs in thousands.

Which of the following values could represent the size of the frog population for the year 2005, as shown in the graph above?

(i)32,800

(ii)3,500

(iii)10,700

(iv)100,000

Question 4

1 point

Which of the following formulas could represent the exponential decay shown in the graph above?

(i)y=100(0.80)

t

(ii)y=80(0.80)

t

(iii)y=100(1.20)

t

(iv)y=1000.80t

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