If you are seated in the back of a large auditorium and you cannot hear the speaker in the front, what aspect of sound needs to be altered to remedy the
situation?

How can i use models to find part of a number hands on part of a number

Science always prove or disprove their explanations by

Suppose that you are in a room with 3 doors and a crack in the ceiling for light. that is all. the doors each have a sign on them that says what there is behind them. door #1. a pool of corrosive acid. door #2. a crocodile that hasn't eaten in 8 months. door #3. a solar "oven". a giant lens that focuses all the sunlight at the entrance of the door. you must choose a door, which door do you choose?