d) \( -24: \square=-4 \)

To solve the equation \( -24: \square = -4 \), we can rewrite it as \( -24 \div \square = -4 \). To isolate the blank, we multiply both sides by \( \square \) and then divide both sides by \( -4 \). This gives us \( \square = -24 \div -4 \), which simplifies to \( \square = 6 \). Double-checking our work: if we substitute \( \square \) back into the original division, we have \( -24 \div 6 \), which indeed equals \( -4 \). Therefore, the answer is 6!