Help!! I really don't get it and if you can please give explanation

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?

Which number line correctly shows 0.8 + 0.3?

What is value of x? enter your answer in the box. x =