Question

what is the coordinate of the midpoint of $overline{st}$?
write your answer as an integer or a decimal, or mixed number in simplest form.

Explanation:

Step1: Identify the coordinates of S and T

The coordinate of S is - 15 and the coordinate of T is 10.

Step2: Use the mid - point formula

The mid - point formula for two points \(x_1\) and \(x_2\) on a number line is \(M=\frac{x_1 + x_2}{2}\). Here \(x_1=-15\) and \(x_2 = 10\). So \(M=\frac{-15 + 10}{2}\).

Step3: Simplify the expression

First, calculate the numerator: \(-15+10=-5\). Then, \(\frac{-5}{2}=-2.5\).

Answer:

-2.5