Answer:

2. 2(m)(n)= 2mn

3. 2 (5a)(7)= (35a)(2)= 70a

4. 2 (8b)(9c)= (72bc)(2)= 144bc

5. 2 (t)(1/2)= 1/4 t^2

6. 2 (c)(1)= 2c^2

7. 2 (4x)(9y)= (36xy)(2)= 72xy

8. 2 (5t)(6u)= (30tu)(2)= 60tu

9. 2 (10m)(15n)= (150mn)(2)= 300mn

10. 2 (8q)(0.3r)= (2.4qr)(2)= 4.8qr