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To predict the average final grade percentage for a student who spent 10 hours on social media, we can substitute x=10 into the equation y=–7.2x+98.9 :
y = -7.2(10) + 98.9
y = -72 + 98.9
y = 26.9
Rounding to the nearest whole number, the predicted average final grade percentage for a student who spent 10 hours on social media is 27%.