Respuesta :

[tex]\begin{gathered} 8+(-3)+15-(-40) \\ 8-3+15+40 \\ 60 \end{gathered}[/tex]

We applied the rules that said:

- If we add a negative number, it is the same as substracting its negative. That is why "+(-3)" is equal to "-3".

- If we substract a negative number is equal to add the negative of this number. That is why "-(-40)" is equal to "+40".