The function P(x) = 95 - 30 log₂ x models the percentage, P(x), of students who could recall the important features of a classroom lecture as a function of time, where x represents the number of days that have elapsed since the lecture was given. The figure at the top of the next column shows the graph of the function. Use this information to solve Exercises 117–118. Round answers to one decimal place.After how many days have all students forgotten the important features of the classroom lecture? (Let P(x) = 0 and solve for x.) Locate the point on the graph that conveys this information.

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Percentage Remembering the Lecture 100 90 80 70 60 50 40 30 20 10 y P(x)= 9530 log₂ x III T TH 1 2 3 4 5 6 7 8 9 10 Days after Lecture X