You have the following expression given in the exercise:
[tex]w-x-y[/tex]And you have the following values for "w", "x" and "y":
[tex]\begin{gathered} w=-12.7 \\ x=14 \\ y=-5.1 \end{gathered}[/tex]Then, to evaluate you need to follow these steps:
1. You have to substitute the values of "w", "x" and "y" into the expression:
[tex]w-x-y=(-12.7)-(14)-(-5.1)[/tex]2. Apply this sign rule for multiplication:
[tex]-\cdot-=+[/tex]Then:
[tex]=-12.7-14+5.1[/tex]3. Add the numbers with negative sign:
[tex]=-26.7+5.1[/tex]4. Finally, solve the subtraction (the result must have the sign of the number with the largest absolute value).
The answer is:
[tex]=-21.6[/tex]