**Answer:**

<h2>4 and 8</h2>

**Step-by-step explanation:**

4 and 8 are corresponding angles as they form at parallel lines cut by a transversal.

4 and 3 are supplementary angles (they both add up to 180°).

4 and 1 are vertically opposite angles and are equal to each other.

<u>From the above explanations, only 4 and 8 are corresponding angles. </u>

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**Answer:**

The bill excluding tax is $31.21 and the 20% tip was $6.24.

**Answer:**

Eventually the coat sales will be negative, which is not possible.

Eventually the temperature will increase or decrease to impossible values.

Some predictions may not be accurate.

**Step-by-step explanation:**

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