Attention curve/-x^2+25x-100/Optimum of 8 to 18/Exercise

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According to recent studies, the student's attention skills during the day are described by the following function

Here, is the time in hours and

is the attention,n measured in micro-credit points per second. When should one start a one and a half hour lecture, such that the total attention skills are optimal? How many micro-credit points will be added during this lecture?