Work out:
\( -5 + 8 \)
Start at \(-5\) and add 8:
\(-5 + 8 = 3\).
\( 7 - 12 \)
Subtracting 12 from 7:
\(7 - 12 = -5\).
\( -9 - 4 \)
Both numbers are negative:
\(-9 - 4 = -13\).
\( 6 + (-11) \)
Adding a negative is like subtracting:
\(6 + (-11) = 6 - 11 = -5\).
\( -3 + (-7) \)
Add the absolute values and keep the negative sign:
\(-3 + (-7) = -(3+7) = -10\).