Subtract. \begin{tabular}{|}\( 4-(-9)=\square \) \\ \( -5-(-1)=\square \) \\ \hline\end{tabular}

Let's tackle these subtraction problems step by step! For the first problem, \( 4 - (-9) \), you can think of subtracting a negative number as adding its positive counterpart. So, \( 4 - (-9) \) becomes \( 4 + 9 \), which equals \( 13 \). Therefore, \( 4 - (-9) = 13 \). For the second problem, \( -5 - (-1) \), again, subtracting a negative number means adding its positive counterpart. Thus, \( -5 - (-1) \) converts to \( -5 + 1 \), which gives us \( -4 \). Hence, \( -5 - (-1) = -4 \). So, the answers are as follows: \[ \begin{tabular}{|}\( 4-(-9)=13 \) \\ \( -5-(-1)=-4 \) \\ \hline\end{tabular} \]