Answer
Rate of change is 2 points increase per hour.
Work Step by Step
In order to find the rate of change lets plug two points from the table (5,85) & (8,91) and plug it into our slope equation
(y2-y1)/(x2-x1)
(91-85)/(8-5) [simplify]
6/3=2
So our rate of change is 2/1. This means that for every hour you study more, your test score (grade) will increase by 2.
