What is the line of reflection between pentagons pqrst and p'q'r's't' ?
a) x = 0
b) y = x
c) y = 0
d) x = 1

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