On a school bus, the teacher sitting in front of me asked if i passed gas -- why did she ask me this and why did she whisper it

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

Write each improper fraction as a mixed number. 9/4. 8/3. 23/6. 11/2. 17/5. 15/8. 33/10. 29/12.