Distance Formula, Midpoint, Endpoints

Which of the following is the correct midpoint formula given two endpoints (x₁, y₁) and (x₂, y₂)?

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Find the midpoint:

Find the midpoint:

• (-3,6)

• (6,-3)

• (4,4)

• none

What is the midpoint of the segment with endpoints (1, 9) and (-3, 5)?

• (-1, 7)

• (2, 7)

• (7, -1)

• (2, 2)

What is the center of MN given M(3, -1) and N(7, -5)

• (5, -2)
• (10, -6)
• (5, -3)
• (2, -2)

Find the endpoint of the segment with the endpoint of (-4, 5) and midpoint of (7, -9)

• (18, -23)

• (13, 18)

• (11,4)

• (1.5, -2)

Find the endpoint of the segment with the endpoint of  (-4, 5) and midpoint of (7, -9) 

• (18, 13)
• (13, 18)
• (11,4)
• (1.5, -2)

  Find the missing endpoint if the midpoint is at (2, -5) and one endpoint is at (12, -5).

• (2, -5)
• (10, -8)
• (-8, -5)
• (12, -5)