19-15 = C Number of students over the course of a year!
19-15 gives us a total of 4 students over the course of the year!
So the value of C is 4 students
I think it’s x= 2 but i would check that
1 is D
2 is A
3. is B
4. is D
5. is C
This is what the diagram is saying
(-4)+(-9)= -13
