What do i say for this
please help :(

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

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)