Please help I will give brainlist

if you are adding two negative numbers, the number is greater

if you are taking a positive number and adding a negative number to it you subtract

so like the answer to number three, -51 + -9 your answer is negative 60, number four your answer is 21, number seven your answer is 43, number 8 your answer is -34 number 11 your answer is 6 number 12 your answer is 12 hopefully you catch on

Step-by-step explanation:

1. -51 + (-9) = -60

2. 27 + (-6) = 21

3. 1 + (-30) = -29

4. 15 + (-25) = -10

5. 50 + (-7) = 43

6. -19 + (-15) = -34

7. (-23) + 9 = -14

8. -19 + (-21) = -2

9. -17 + 11 = -6

10. 20 + (-8) = 12

11. (-15) + (-7) = -22

12. 12 + (-14) = -2

well if he bought them at 5 cedis each sold them at 7 cedis each then he would make a profit of 2 cedis of each book. if in total he made 150 cedis profit that means he sold 75 books. he lost 12 books at the start so that means he originally bought a total of 82 books.

step-by-step explanation: