Question

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

Explanation:

Step1: Identify the coordinates

The coordinate of C is -42 and the coordinate of D is -39.

Step2: Apply mid - point formula

The mid - point formula for two points \(x_1\) and \(x_2\) on a number line is \(\frac{x_1 + x_2}{2}\). Here \(x_1=-42\) and \(x_2 = - 39\), so \(\frac{-42+( - 39)}{2}=\frac{-42 - 39}{2}=\frac{-81}{2}=-40.5\)

Answer:

-40.5