Question: The first problem (38) I attempted the correct answer is -13. but, my teacher said there is an incorrect value of (-4.5) Please help me

The first problem (38) I attempted the correct answer is -13. but, my teacher said there is an incorrect value of (-4.5) Please help me fix it.

Number 21. I need help with please show all steps so I can retrace them.

The first problem (38) I attempted the correct answer is -13. but,my teacher said there is an incorrect value of (-4.5) Please help

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