How would I simplify the expressions on the picture?

7.   8.  9.  10.  11.  12.  13.  14.  15.

Step-by-step explanation:

7. × = when multiplying with exponents you add

8. = when dividing with exponents you subtract

9. = when it's power to power, you multiply

10. =  (subtract exponents)

11. =  (multiply exponents)

12. =  (add exponents and )

13. = (multiply exponents)

14. =   (subtract exponents and )

15. = (add exponents same as #12)

360 different combinations

answer is:

1.75 pounds