What the answer

Distance between two points
(-5,5) and (3,-3)

Is the orthocenter of a triangle on the inside ?

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

Just tell me how to set up the equation.