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To find the x-coordinate of the midpoint of the line segment \( ST \) with endpoints \( (-1, -4) \) and \( (9, 8) \), we use the midpoint formula:

\[
\text{Midpoint} = \left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right)
\]

For the x-coordinate:

\[
x = \frac{-1 + 9}{2} = \frac{8}{2} = 4
\]

Thus, the x-coordinate of the midpoint is **4**.

Would you like more details on the solution or have any questions?

Here are five related questions to expand on this:

1. How do you find the y-coordinate of the midpoint?
2. Can the midpoint formula be applied in three dimensions?
3. What happens if both points are the same? What would the midpoint be?
4. How do you calculate the distance between two points using their coordinates?
5. What is the significance of the midpoint in geometry?

**Tip:** The midpoint formula works in any dimension, as long as you have the coordinates of the endpoints.

The coordinates of the endpoints of segment ST, in the standard (x,y) coordinate plane, are (-1,-4) and (9,8). What is the x-coordinate of the midpoint of ST?

Solve for the x-coordinate of the midpoint of segment ST with endpoints (-1, -4) and (9, 8). Learn how to apply the midpoint formula to find the solution. Suitable for middle school geometry students.

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