Answer:
I agree, also i think the answer is 15 :)
Step-by-step explanation:
1. 72 to 50 points
50/72 = 69%
100-69= 31% decrease
2. 14 to 40 books
14 / 40 = 35%
100-35= 65% increase
3. 10 plus 30% increase
10 * 0.3 = 13

This is not possible, as -6 is not equal to -4.
Answer:

Step-by-step explanation:
Hi there!
Point-slope form:
where m is the slope and (x₁,y₁) is the given point
Plug in the slope and the point

I hope this helps!