Rate of change is like slope between the two points. The x values given are 0 and 3. Starting st the first option we find the matching y values and the find the slope.
C, 1,020. There are 67 out of 100 students who do at least 2 hrs of chores a day, or 67%. Converting that to a decimal, you get .68, which you multiply by the number of students at the school to get your answer.