Use a diagram to list the factor pairs of each number

I don't know what you mean by diagram but for
1 here is the answer.

1) factors of 18: 1, 2, 3, 6, 9, 18 (because 1 x 18 =18, 2 x 9 = 18, 3 x 6 = 18. )

2) factors of 52: 1, 2, 4, 13, 26, 52 (because 1 x 52 = 52, 2 x 26 = 52, 4 x 13 = 52. )

3) (Idk, so sorry! :c )

4) 402
^ ^
201 • 2
^
3 • 67

5) 36
^ ^
2 • 18
^
2 • 9
^
3 • 3

6) 32
^ ^
2 • 16
^
2 • 8
^
2 • 4
^
2 • 2

7) (Last but not least)

27
^ ^
3 • 9
^
3 • 3

I hope I helped. I'm not very good at math xD

C. 1,855

Becuase if you multiply and then add it will give you the answer.