Kayla was at the surface of a swimming pool and recorded the following two measurements in feet on a number line. -9 which represents the depth of water in the swimming pool +10which represents the height of the slide at the pool part: a what does 0 represent in this situation part: b describe the height of the slide in relation to 0 in the situation part: c kayla held a pole in the swimming pool. the bottom of the pole was at a depth of 3 ft how should kayla mark the level of the bottom of the pole on the number line? explain how you determined this