1.3 Midpoint Formula and more

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

What is true about a midpoint?

Find the midpoint: (-1,9), (7,-1)

Find the MIDPOINT:

If a segment has one endpoint at (-4, 5) and its midpoint is at (7, -9), what are the coordinates of its other endpoint?

A race starts at coordinates ( -10, -6). There is a water stop halfway through the race at ( 7, 4). What are the coordinates of the finish line?

A cake was located in the center of a room at (9, -3). A dog was located at (-5, 7). The dog's owner was the same distance from the cake as the dog. Where was the owner located?

What is the area formula of a triangle? (X means times in the answer choices)

Let's say we are given A=(-1,2), B=(0,4), and C=(-4,4) as point for a triangle, what is the area of the triangle?

Let's say we are given A=(-1,2), B=(0,4), and C=(-4,4) as point for a triangle, what is the perimeter of the triangle?