2, -1, -4
you have -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3 , 4 , 5, 6 , 7. 8
Answer:
0.6 books
Step-by-step explanation:
Divide 9 by 15 to get 0.6 books a month