Question

What is the rate of change in the number of students

Answer 1

B.) 50 because ten years time gap, 50 x 5 is 250

Answer 2

If there were 12000 students in 2005, and 12250 students in 2010, we know that in a 5 year period, the student total increased by 250.

So the rate of change in students per year would be 250/5 years
Which is 50/yr, so the answer is B.

Hope this helped