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Because the length cannot be negative the height of the plane is ___ miles.

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Because the length cannot be negative the height of the plane is ___ miles. ???????????????? ???????????????? ???????????????? ???????????????? ???????????????? ???????????????? ????????????????-example-1

1 Answer

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Look at all the steps above. They lead to a double solution. The symbol


x=\pm 5

means that
x can be either positive or negative 5. You can't accept negative values for lengths, so you're left with one option only.

User Jamaxack
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