Addition and subtraction expression

#1
rule : r - 12

Missing number = 25 (37-12 = 25)

#2
rule: a + 34
Missing number = 43 (9+34 = 43)

#3
rule: s - 5
Missing number = 20 (25-5 = 20)

#4
rule: b+16

Missing number = 0 (0+16= 16)

#5
rule: w+3

Missing number = 9 (6+3= 9)

#6
rule: n-11

Missing number = 22 (33-11= 22)

#7
15 - n when n = 9
15 - 9 =6

#8
32 more than a number d:
 
32 +d
answer is C. 32+d

#9
Variable is an unknown value. So you need to solve that unknown value in the problem.

Zero is the mid point of the line segment

They are the facts that mary is a citizen