Answer:
Part a: 7.5
Part B: It changes by 1.5
Explanation:
PART A:
In the table you are suppose to find out how much it increases by so you subtract,


Since we know the difference is 1.5 you will add 6 by 1.5

Therefore, the answer is 7.5
PART B: It changes by 1.5 because the difference between the increase in points is 1.5