Subtract original amount from new amount:
84 - 39 = 45
He bought 45 books.
The value of z is more than 34. This question is ... Ehhh. very tricky, with bad answer choices...
Recall that the slope is the "average rate of change" of any function.

11- 59.1. Got the Answer for #11, but for #12 you lowkey should just use any type of calculator for that shape
Answer:
Step-by-step explanation:
1) 8.9
2) 27.8
3) 24.3
4) 11.4
5) 27.5
6) 49.2
7) 8.1
8)4.8