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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