How many times are equal to 4 pounds

Can someone me and do the problem plz so i can understand it more better

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

With both problems. a. s.a. p directions on photo ^