Question

find the length of \overline{ef}.

ef = \boxed{?}

Explanation:

Step1: Use the distance formula

The distance between two points \(x_1\) and \(x_2\) on a number line is \(|x_2 - x_1|\). Here, \(x_1=-8\) and \(x_2 = 21\).
So, \(EF=|21-(-8)|\).

Step2: Simplify the expression

\(21-(-8)=21 + 8\).
\(|21 + 8|=|29|\).
Since the absolute value of \(29\) is \(29\).

Answer:

\(29\)