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b. 90-15 *log(1) = 90
c.90-15*log(7)=77.33
d. 90-15*log(13)=73.29
e.75=90-15*log(t+1)
15*log(t+1) = 15
t+1 = 10
t=9
The average score would have decreased to 75 after 9 months
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