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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

F(t)=(0.95)^(t/2)

The function F(t) gives the percentage, as a decimal, of information Dianna remembered t days after memorizing lines for a play. Assuming she did not work on her lines again, what is the best interpretation of the meaning of the function F in this context?

A.On any given day, Dianna will forget 95% of the lines 1 day after she memorizes them.
B.On any given day, Dianna will forget 95% of the lines 2 days after she memorizes them.
C.On any given day, Dianna will remember 95% of the lines 1 day after she memorizes them.
D.On any given day, Dianna will remember 95% of the lines 2 days after she memorizes them.

答案和解析

答案：D

解析：

Option D is correct. After 2 days, the exponent of the function will be 2/2=1. Dianna will remember 0.95^1*100 or 95% of the lines.