Answer:
The value of the expression is;
[tex]-10.1[/tex]Explanation:
Given the expression;
[tex]-7.8+4.2-6.5[/tex]To solve;
[tex]\begin{gathered} 4.2-7.8-6.5 \\ =4.2-14.3 \\ =-10.1 \end{gathered}[/tex]The value of the expression is;
[tex]-10.1[/tex]