# SOLUTION: Study Time and Test Grades. A mathematics instructor asserted that students' test grades are directly proportional to the amount of time spent studying. Brent studies 15 hr for a

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 Question 326635: Study Time and Test Grades. A mathematics instructor asserted that students' test grades are directly proportional to the amount of time spent studying. Brent studies 15 hr for a particular test and gets a score of85. At this rate, what score would he have received ifhe had studied 16 hr? Answer by Fombitz(13828)   (Show Source): You can put this solution on YOUR website!Grade is directly proportional to time. . . . or