Points EC bisects points AD at C. For each of the following, find the value of 'x' and the measure of the indicated segment. Please correct me if I'm wrong!

1. AC= 3x+6 and CD=2x+14
Answer: x=8
AC= 30

2. AC= 5x-8 and CD=16-3x
Answer: x=3
What will AD be because I'm sooo confused on how to work it out..

3. AD= 6x-4 and AC=4x-3
Answer: x= .5
CD= I'm confused how you do this one too

4. AC=3x-1 and AD= 12-x
Answer: x= -3.25
CD= I'm have trouble working this one out too

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