What does historians need to determine the authenticity of a soure in order to?

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

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value