Which of the following is not an example of a chemical reaction? rust, photosynthesis, melting ice, heat from fire?

Aplane takes off from an airport and flies to town a, located d1 = 215 km from the airport in the direction 20.0° north of east. the plane then flies to town b, located d2 = 230 km at 30.0° west of north from town a. use graphical methods to determine the distance and direction from town b to the airport. (enter the distance in km and the direction in degrees south of west.)

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

How does an observation about an object differ from an inference about that object