a) -3 + (- 8). b) -9 +12. c) -17 + (- 40) + (- 18). d) 20 + 30 + ( -10).

Let's solve these expressions step by step:

a) \(-3 + (-8)\):
\[
-3 + (-8) = -3 - 8 = -11
\]

b) \(-9 + 12\):
\[
-9 + 12 = 12 - 9 = 3
\]

c) \(-17 + (-40) + (-18)\):
\[
-17 + (-40) = -17 - 40 = -57
\]
\[
-57 + (-18) = -57 - 18 = -75
\]

d) \(20 + 30 + (-10)\):
\[
20 + 30 = 50
\]
\[
50 + (-10) = 50 - 10 = 40
\]

### Final Answers:
a) \(-11\)  
b) \(3\)  
c) \(-75\)  
d) \(40\)

Would you like more details on any part of the solution? 

Here are some related questions to explore further:

1. What is the result of \(-15 + (-5)\)?
2. How does the addition of negative numbers affect the final sum?
3. What is the sum of \(-20 + 30 + (-15)\)?
4. How would you solve \(-25 + 25 + (-50)\)?
5. What is the significance of zero in addition when combining positive and negative numbers?

**Tip**: When adding a negative number, it's the same as subtracting the corresponding positive value.

The query submitted by the user: a) -3 + (-8). b) -9 +12. c) -17 + (-40) + (-18). d) 20 + 30 + ( -10).

Learn how to solve problems involving the addition of negative and positive integers with detailed step-by-step solutions. This example covers integer arithmetic and the properties of addition. Suitable for students in Grades 6-8.

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