In each equation, select an operation to make the equation true.
Choices are +, -, x, and / (divide)

1. 24 ? 3/4 = 18
2. 24 ? -3/4 = -32
3. 12 ? 15 = -3
4. 12 ? -15 = 27
5. -18 ? -3/4 = 24