An elliptical culvert is 3.5 feet tall and 7.5 feet wide. It is filled with water to a depth of 0.95 feet. Find the width of the stream.

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The given points are T(3,1) and U(5,3)

The x coordinates of these given points are 3 and 5. Add them up to get 3+5 = 8. Then cut this in half getting 8/2 = 4. This is the x coordinate of the midpoint.

The y coordinates are 1 and 3. They add to 1+3 = 4. Then that cuts in half to get 4/2 = 2. This is the y coordinate of the midpoint.

The midpoint is (4,2)

Effectively, we just used the midpoint formula

In short: add the corresponding coordinates, then divide by 2.