To find the line of best fit, either use your graphing calculator or plot the points and draw a line that passes through them.
The slope represents the number of new students per year. The y-intercept might represent the number of students enrolled when the school opened.
Use the line of best fit that you found in part (a) to predict this.
See part (c).
The equation will not necessarily help answer this. The school would not have opened with zero students.