Step-by-step explanation:

A.

1. 19

2. -13

3. -1

4. 10

5. 9

6. -6

7. -4

8. 4

9. 0

10. -9

B.

1. -1

2. 4

3. 13

4. -15

5. 11

6. 0

7. -5

8. 5

9. 2

10. 9

Answer:

A. Add the following.

1.(+9) + (+10) = 19

2.(–7) + (–5) = - 12

3.(+5) + (–6) = - 1

4.(+2) + (+8) = 10

5.(–1) + (+10) = 9

6.(–3) + (–3) = - 6

7.(+4) + (–8) = - 4

8.(–8) + (+12) = 4

9.(–11) + (+11) = 0

10.0 + (–9) = - 9

B. Subtract the following.

1.(+7) –(+4) = 3

2.(–2) –(–6) = 4

3.(+10) –(–3) = 13

4.(–6) –(+9) = -15

5.(–10) –(+1) = - 11

6.(–4) –(–4) = 0

7.(+5) –(+10) = - 5

8.(–12) –(+7) = - 19

9.(+8) –(+6) = 2

10.0 –(–9) = 9