book Maths Puzzle Numerical Ability

Given: Triangle ABC, AD=CB, and AC>DB
Prove: M angle ADC> M angle DCB

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book Other Question

I do not understand how to do this question. I tried making a chart and finding the slope, but it didn't help. e_e;;

Help on this problem would be greatly appreciated. Thank you Distributive, Associative, Commutative, or Identity?

1) 7k + (-3k)

2) 5x + (3x + 7)

3) 11(12p)

4) -9y + 2y + 7

5) 2m - 3m - 8n + n

6) 2x + (x + y)