A number line is shown. Point P is a point on the number line. Part A: Melvin claims that the opposite of point P is a positive number. This statement is only sometimes true. Identify a value for point P where the opposite of point P is a positive number. Identify a value for point P where the opposite of point P is a negative number. Explain why the opposite of point P is only sometimes a positive number. Part B: Melvin also says that the absolute value of point P is always positive. This statement is always true. Explain why the absolute value of point P is always positive. Show your two answers and two explanations.