Find the value of x

height: x+9
length: 18
other triangle: height: x+9
length: 8
(they are technically the same triangle but split into two, it's a right triangle)

-1, maybe or maybe not this is my first time doing this

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