Adding and Subtracting Expressions?

Question

I get the easy stuff..
Example: 4(3x + 7) that equals 12x + 28

I'm confused about giving the opposite of each expression and simplifying some expressions. 

Please answer these: 
      Directions: Give the opposite of each expression.
1. -10t + 21
2. 4a - 4b
3. -7a - 6b - 4c
4. -6x + (2a + 5)
5. (c + d) + y

     Directions: Simplify the following expressions.
1. 2a - a
2. 6r - 3r
3. 5a - (3a + 1)
4. (3a +2b) + (-3a + b)
5. (6 - 2c) - (2c+2)
6. (4q + 2) - (2q - 3)
7. 3(f + g) + 7g

Please explain how you got the answers and why in detail. I really want to learn how. Thank you so much! This is super confusing to me!

? · Accepted Answer

10t + -21
4a + -4b

Alexander H · Answer

Use better wording to describe what you want help for. What do you mean "the opposite"? Your example is 4(3x+7) = 12x+28 doesn't describe too well what you want to do for the rest of your problem. Type up what your book says to do.

Adding and Subtracting Expressions?

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