A submarine is 8 ft below the sea. It notices a rare fish 7 ft below and descends
further to take a closer look.

The submarine descended while it was already 8 feet below the sea so 8+7=15

a

step-by-step explanation:

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above