Question

△FEB≅△CNB. What is length of BN¯¯¯¯¯¯ ?

Answer 1

we know that

The CPCTC states that corresponding parts of congruent triangles are congruent

so

△FEB≅△CNB

that means

$FE=CN\\FB=CB\\EB=NB$

we have

$FE=6.1\ units\\FB=4.8\ units\\EB=3.8\ units$

therefore

$BN=3.8\ units$

the answer is

the length of BN is $3.8\ units$

Answer 2

3.8
You simply match them up in corresponding order and use CPCTC