The diagram shows rays of light from a point source, p, that reach a detector, d, along two paths. one path is a straight line, while the other is bent by reflection off a mirror. what is the value of b, correct to one decimal place? assume that all the points in the diagram lie in the same plane.

5.4

4.2

3.6

2.8

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?