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**Girlaaaaaaaa** I have a question I worked out the problems on the bottom but it says my answers are wrong. Can you please tell me what I did wrong?

The first problem is the first attached file for it I got the answer [2,4] by doing the sign chart

The second problem is the second file attached for it I got the answer [-4,0]U[8,13]

The third problem is the third file attached and for it I got (-infinity,-6)U(6,infinity)

The fourth problem is the fourth file attached and for that I got (-infinity,-13]U[4,infinity)

All those answers are wrong, so can you tell me what I did wrong?