I have a few questions for 50 points please answer them truthfully and make sure you answer all of them... Thank You

1) What is the sum of –18 and 12?
A. –6
B. –12
C. 12
D. 6

2) Evaluate: 9 – (–12)

A. 3
B. 21
C. –3
D. –21

3) Which number sentence is true?
A. –2.0 + (–0.5) = 2.5
B. –4.5 + 6.5 = –2.0
C. 3.0 + (–0.5) = –2.5
D. 5.5 + (–2.5) = 3.0

4) Which number sentence is true?
A. –8.2 + (–4.1) = –4.1
B. –8.2 + (–4.1) = 4.1
C. –8.2 + (–4.1) = –12.3
D. –8.2 + (–4.1) = 12.3

5)
Evaluate: -9/5 - -9/5
A. 0
B. 2
C. 18/5
D. -18/5

Thank You Sooooo Much It Helps me A Lot!!