QuestionCalculate the results of these expressions: $10+(-5)$, $-6+(-9)$, $-1+12$, $-9+13$, $-2+(-7)$, $11+(-3)$, $-5+25$, $-4+(-4)$, $21+(-9)$.

Studdy Solution
In this operation, we are adding a positive number to a negative number. The rule for this is the same as in3.
$$21+(-9) =21 -9 =12$$The solution to the problem is\begin{tabular}{c|c|c} $5$ & $-15$ & $11$ \\ \hline$4$ & $-9$ & $8$ \\ \hline$$ & $-8$ & $12$ \\ \hline\end{tabular}