X = –8, y = 7, and z = –11. x - (-z)

-19 is the right answer.

Hi there!  

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I believe your answer is:  

The first question.

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Here’s why:  

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Statistical questions have answers in which data varies. The first question, "How many sticks of gum can you chew at one time?" can be statistical because not all people can chew the same number at one time. Some can chew 2 sticks, others can chew 3 or 4.The other three questions can be answered with a fixed number.

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Hope this helps you. I apologize if it’s incorrect.