find the digit that makes 3,71_ divisible by 9

do the actual answer not just the letter please i really need help i have a d- the highest grade i have is a c+ help pleaseeeeeeeeeeeeee
where is tempest

2 answers

the digits must add to a multiple of 9
3+7+1 = 11, so
3717 = 413*9

read up on casting out nines
Answers are for Math 6A, Number Theory and Fractions Unit Test Part 1.
If you get anything wrong, then this isn't your version of this test.
1. 7
2. 1, 2, 3, 4, 6, 8 ,12, 16, 24, 48.
3. 2^3 x 3^3 x 13.
4. 20
5. 15
6. 16/28
7. 2/5
8. 4/9
9. 23/7
10. 3 5/8
11. 43/8, 5 3/8
12. 108
13. 80 seconds
14. 3/4 = 6/8
15. 6 7/20
16. 1.46
17. 2 3/20 < 2 1/4 < 2 29/60
18. 0.1375, 0.25, 5/8, 11/16
19. Write Yourself
20. 9.5 = 19/2, 9 2/4 = 19/2
21. 5 1/4 because 21 รท 4 = 5 with a remainder of 1.
22. Write Yourself
23. 0.64
Your welcome.
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