Answer Happy

5. Psychologists perform experiments to determine how quickly people forget things. In one experiment, lists of words were read to people to determine how many words they could remember at a later time. The result was scored as a percent, called the retention score. The retention score, r, was expressed as a function of time, t minutes, by the equation r = 18logt + 84 a) After how many minutes was the retention score 50% (i.e.,)? (Round your answer to the nearest minute) b) Suggest a reasonable domain and range in context of the problem. Explain your reasoning.