## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$9$
The given description, "the difference between $3.8$ and $-5.2$" translates to \begin{array}{l}\require{cancel} 3.8-(-5.2) .\end{array} Since the expression $a-(-b)$ simplifies to $a+b,$ the expression above simplifies to \begin{array}{l}\require{cancel} 3.8-(-5.2) \\\\= 3.8+5.2 \\\\= 9 .\end{array}