Answer:
Simplifying the given expression gives;
[tex]12.25[/tex]Explanation:
Given the expression;
[tex]15.7+(-3.45)[/tex]Simplifying;
[tex]\begin{gathered} +\times-=- \\ 15.7+(-3.45) \\ =15.7-3.45 \\ =12.25 \end{gathered}[/tex]Therefore, simplifying the given expression gives;
[tex]12.25[/tex]