1st post from a math noob who is completely clueless...

hello. i recently returned to school after dealing with the flu and im way behind. I got some work out of the book today and im clueless as to how to even go about deciphering what evaluate and simplify means. heres the problems i need to work on.

1. 3x - 2 (x+5)

2. 4(a - 3b) - (5a - b)

3. 2x - 3[ x - 4 (2-x)]

4. -4[4y-3(y-2)]

5. -2[x - 2(x-y)] + 5y

6. 5[2-3(6x-1)]

7. -2(4xsquared - 5)

8. -9(-y squared + 4y-1)

9. - 1/2 (-2x)

10. 44x(1/11)

11. 7x+(-11y)+9x

12. 9a+2b-(-6a)+7b

evaluate the following

1. 5a-3b squared when a=-6 and b= 2

2. a-4b/2c when a=1 b=-1 and c=5

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would somebody be so kind as to tell me what simplifying and evaluating mean in this context and a simple dummy-proof formula/protocol that i can apply to all these so i can solve them myself. im one that learns from example so if someone could solve a few of these with the essential steps needed id really really appreciate it.thanks.